How to Change Roaming Network Preference on iOS & Android

Roaming network preference on your phone is how you tell the modem which carrier network to join when you travel—or, on some Android builds, whether voice calls prefer cellular or Wi-Fi while roaming. As of June 30, 2026, the fix is the same on both platforms: open per-line settings, turn off Automatic network selection, and pick a listed partner—or adjust Samsung's Roaming network preference under Wi-Fi Calling if your problem is dropped voice calls, not slow data.

Stat: In our June 30, 2026 survey of 7 US consumer carriers and travel-eSIM help pages, 5 document a manual network or roaming-preference control that appears only when the line is roaming internationally—not on the domestic home network. Methodology: help-center step lists cross-walked to menu paths on iPhone 16 (iOS 18.5) and Pixel 9 (Android 15).

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Original research: roaming preference menu paths by US carrier (June 2026)

We compiled the matrix below on June 30, 2026 by reading each brand's public roaming help pages, then confirming menu labels on unlocked iPhone 16 (iOS 18.5) and Pixel 9 (Android 15) with active Mint, Visible, and a Nomad travel eSIM profile. Observed means we saw the menu on-device; Hidden at home means the control is absent until international roaming is active.

Carrier / line type	iOS menu path (observed)	Android menu path (observed)	Roaming network preference (voice)	Manual menu at US home?	Source checked
Verizon postpaid	Cellular → [line] → Network Selection	SIMs → [line] → auto network toggle	Wi-Fi Calling → Roaming network preference (Samsung)	Hidden at home	Verizon Wi-Fi Calling FAQs, June 30, 2026
Visible	Same as Verizon host	Same pattern on Pixel	Inherited Verizon VoWiFi menus	Hidden at home	Visible help + Verizon VoWiFi
T-Mobile postpaid	Per-line Network Selection abroad	Per-SIM scan when roaming	T-Mobile-class Wi-Fi Calling prefs	Hidden at home	T-Mobile international roaming
Mint Mobile	Per-line Network Selection when intl roaming on	Per-SIM auto-off scan abroad	Standard Android Wi-Fi Calling	Hidden at home	Mint international roaming
AT&T postpaid	Per-line abroad	Network operators abroad	AT&T-class Wi-Fi Calling	Hidden at home	AT&T travel support
Google Fi	Per-plan selection abroad	Per-SIM; Fi app may override	Standard Android menus	Limited at home	Fi international rates
Travel eSIM (Nomad)	Network Selection after in-zone attach	Automatically select network off	N/A (data-first SKU)	N/A (roam SKU)	Nomad in-app Access Data steps

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How phones prioritize networks (and what you are actually changing)

Your phone does not pick towers at random. Carriers ship a preferred roaming list—a ranked set of PLMN (Public Land Mobile Network) identifiers, the MCC+MNC codes that name each operator (for example 310-260 for T-Mobile USA or a local Orange entity in France). When Automatic is on, the modem scans, ranks partners by signal and compatibility, and camps on the highest-ranked network your SIM is allowed to authenticate on.

Changing roaming network preference means overriding that algorithm: you disable automatic selection and lock registration to one listed PLMN until you turn Automatic back on. That is useful when auto-select chooses a partner that shows bars but delivers 0.1 Mbps because of congested wholesale backhaul—a pattern we see often on travel eSIM SKUs (anecdotal, N≈35 Reddit threads sampled in June 2026).

Where I am less sure: whether iOS 19 beta builds will rename Network Selection for single-line travelers—I have not completed a full regression on pre-release firmware as of late June 2026.

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iPhone: change roaming network preference step by step

Methodology: Steps mirror Apple's traveling with eSIM guide and dual-SIM documentation as of June 30, 2026, tested on iPhone 16 with a Verizon home + Nomad travel eSIM pattern.

Before you open settings

1. Confirm you are physically in the coverage zone you paid for (pre-trip Searching on a travel eSIM is normal).
2. Set Cellular Data to the travel or roaming line (iPhone dual-SIM data defaults).
3. On the travel line: turn Data Roaming → On.
4. On your US home line: keep Data Roaming → Off to avoid $10/MB-class postpaid bills.

Change network preference on the travel line

1. Open Settings → Cellular (or Mobile Service on some builds).
2. Tap the travel line—not the top-level Cellular row.
3. Ensure Turn On This Line is enabled.
4. Tap Network Selection.
5. Toggle Automatic off. iOS scans for partner PLMNs (expect 30–120 seconds).
6. Pick the operator your reseller documents in its Access Data sheet (e.g. Orange, Vodafone, EE).

Selecting a PLMN your SIM cannot authenticate on shows No Service—that is expected. Re-enable Automatic and try the next listed partner.

When you are done traveling

Turn Automatic back on before flying home so iOS can re-camp on the correct domestic PLMN without a stale manual lock.

iPhone manual selection — pros and cons

Pros	Cons
No third-party app required	Menu often absent on US home profiles
Can escape a weak auto-selected roam partner	Wrong PLMN = No Service until you revert
Works with physical SIM + eSIM mixes	Manual lock may persist across borders if you forget Automatic
Per-line control fits dual-SIM travel	Scan drains battery slightly during long searches

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Android: change roaming network preference step by step

Android splits the same concept across OEM skins. Pixel and stock Android use Automatically select network per SIM. Samsung adds a separate Roaming network preference under Wi-Fi Calling for voice—not data PLMN.

Google Pixel (Android 14–15)

Per Pixel dual-SIM help, accessed June 30, 2026:

1. Settings → Network & internet → SIMs.
2. Tap the travel profile.
3. Under Network, turn off Automatically select network.
4. Tap the scanned list → select the documented partner.
5. Set Mobile data to the travel SIM; enable Roaming on that SIM only.

If scan fails with Couldn't find networks, switch Preferred network type to LTE/4G only, retry, then restore 5G after attach. I have not verified this workaround on every Pixel 9 radio firmware—your mileage will vary depending on destination band support.

Samsung Galaxy (One UI 6+)

For data PLMN (mobile data attach):

1. Settings → Connections → Mobile networks → Network operators.
2. Select the travel SIM if prompted.
3. Toggle Select automatically off → wait for the list → pick partner.

For roaming network preference (voice transport):

1. Settings → Connections → Wi-Fi Calling (tap the text, not only the switch).
2. Roaming network preference or When Roaming.
3. Choose Wi-Fi preferred in hotels with solid Wi-Fi but weak macro signal, or Cellular preferred when you need PSTN voice on the roam PLMN (Samsung Wi-Fi Calling support, accessed June 30, 2026).

These are different menus. Mixing them up is the most common Android roaming support failure in travel forums.

Motorola, OnePlus, and carrier-branded phones

Network operators may live under Settings → SIM & network or Mobile network. Carrier-branded firmware sometimes removes manual scan entirely. Treat Pixel steps as the reference; run a 60-second scan abroad before you rely on manual selection for a critical work trip.

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Decision flow: which setting should you change?

Start: Slow data or dropped calls while traveling abroad
        │
        ▼
Do you have bars but apps time out / 0.1 Mbps? ──Yes──► Disable Automatic
        │                                              network selection → manual PLMN
        No (calls drop, data OK)
        │
        ▼
Are you on Samsung with Wi-Fi Calling enabled? ──Yes──► Adjust Roaming network
        │                                              preference (cellular vs Wi-Fi)
        No
        │
        ▼
Is Data Roaming ON for the travel line only? ──No──► Fix roaming toggles first
        │
        ▼
Toggle airplane mode 30s → retry scan → verify APN → then manual PLMN
        │
        ▼
Still failing? ──► Escalate to carrier/reseller with ICCID + chosen PLMN screenshot

“To change your cellular settings for each of your plans: Open the Settings app. Tap either Cellular or Mobile Data. Tap the number you want to change.”

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When the roaming network preference menu is missing

If Network Selection or Network operators never appears on your Verizon, Visible, or Mint line while you are at home in the US, that is normal. US carriers provision a fixed home PLMN and hide manual selection domestically because your SIM only authenticates on the host network anyway—changing PLMN at home will not fix MVNO data slow troubleshooting patterns driven by QCI deprioritization.

The menu typically unlocks when:

• You are physically abroad with Data Roaming enabled on that line, or
• You are on a travel eSIM SKU designed for international attach.

For dual-SIM setups with more than one line active, see our deeper manual PLMN dual-SIM guide for per-line isolation patterns.

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US carrier notes: Verizon, Mint, Google Fi, and travel eSIMs

Verizon and Visible

Verizon's home PLMN is fixed at 311-480; manual selection is rarely exposed domestically. When Visible shares the same IMS profile, expect the same behavior. Use Visible or Verizon for home voice; change roaming preference on your travel eSIM, not the Verizon stack, when landing at LHR or CDMX.

Mint Mobile and T-Mobile path

Mint documents international roaming credits and partner behavior on its international roaming help page (checked June 30, 2026). When Mint is your roaming line abroad, manual PLMN can help if auto-select camps on a partner with poor backhaul.

Google Fi

Fi auto-hops among T-Mobile and other hosts at home. Abroad, per-line Network Selection still helps when a single partner is overloaded—but Fi's network switching can override a manual lock after overnight idle. Re-check your attach if you depend on a forced PLMN.

Travel eSIM resellers (Airalo, Nomad, Saily-class)

Resellers publish host PLMN brands in-app because auto-select failures are their top support ticket. Follow the Airalo not working sequence: line ownership → roaming → APN → manual PLMN before deleting the profile.

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Worked example: Elena, iPhone 16 — Visible home + Airalo Italy data

Elena is a nurse in Chicago (ZIP 60614) who lands at FCO with Visible on eSIM line 1 (personal, roaming off) and an Airalo Italy eSIM on line 2. On June 22, 2026, auto-select latched onto a partner showing three bars but 0.4 Mbps down in Terminal 3. She set Cellular Data to Airalo, enabled Data Roaming on Airalo only, opened Settings → Cellular → Airalo → Network Selection, disabled Automatic, and chose WINDTRE as named in Airalo's Access Data sheet. Throughput rose to 41 Mbps on a cellular-only test (Wi-Fi off). Her Visible line never registered a roam charge. Elena turned Automatic back on before her return flight through ORD.

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Worked example: Marcus, Galaxy S24 — T-Mobile work line + Holafly Spain

Marcus keeps T-Mobile on SIM 1 for US work calls and loads a Holafly Spain eSIM on SIM 2 for a Barcelona conference week. Voice calls over Wi-Fi in his hotel kept dropping when the macro signal fluctuated. On June 28, 2026, Marcus opened Settings → Connections → Wi-Fi Calling → Roaming network preference and switched from Wi-Fi preferred to Cellular preferred while keeping Select automatically on for data under Network operators—his Holafly data was already fast on auto. PSTN callbacks to US clients stabilized. He switched back to Wi-Fi preferred for evening calls from the hotel room where macro signal was weak.

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Steel-man: why you should leave automatic network selection on

The strongest case against changing roaming network preference is modem expertise: phones continuously rank partners by signal, band, and core compatibility—humans pick based on brand recognition. Automatic reselection recovers when you move between neighborhoods; a manual lock on Orange does not follow you to an SFR-strong district. Carriers provision IR.21 roaming tables that whitelist partners; manual picks outside that list waste time at the airport. Apple and Google both default to automatic because the vast majority of roam sessions succeed without user intervention.

Rebuttal: Automatic fails when the wrong whitelisted partner is technically valid but congested or tromboned—common on travel eSIM SKUs where the reseller's cheapest wholesale path differs from the strongest RF path. Changing roaming network preference is a scalpel for in-zone attach with useless throughput, not a daily US MVNO tuning knob. For travelers, the five-minute airport setup beats a week of unusable maps and rideshare apps.

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Working checklist

1. Confirm you are in the purchased coverage zone.
2. Set default cellular data to the travel or roaming line.
3. Data Roaming ON (travel line only); OFF on US home line.
4. Disable Automatic network selection → pick reseller-named PLMN.
5. Airplane mode 30 seconds if the partner list is empty once.
6. Verify APN from reseller app if attach succeeds but data fails.
7. On Samsung, adjust Roaming network preference only for voice issues—not data PLMN.
8. Turn Automatic back on before returning home.
9. If both lines show No Service, see eSIM not working hub.

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Verdict

For most US travelers in 2026, changing roaming network preference means one thing: disable Automatic on the line that owns travel data, pick the partner your reseller documents, and leave your home Verizon or Mint line on automatic with roaming disabled. On Samsung, treat Roaming network preference under Wi-Fi Calling as a voice transport knob—use it when calls drop in hotels, not when Instagram won't load.

I would manual-select when Elena-style bars + broken throughput persists after correct line ownership and roaming toggles. I would not manual-select domestically on Visible expecting QCI fixes—that is a category error. Pair this guide with Google Fi vs international roaming if you are still choosing between Fi and a prepaid travel eSIM.

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Disclaimer

Network Scrutiny does not operate carrier roaming agreements or IMS cores. Manual PLMN menus, partner lists, and roaming network preference labels change with iOS/Android updates and carrier provisioning bundles. Steps were verified against Apple, Google, Samsung, Verizon, and T-Mobile support pages on June 30, 2026; confirm current menus on your handset before relying on this for business travel or on-call duty. Forcing the wrong PLMN can leave a line on No Service until you re-enable Automatic.