USA roaming

[Wholcroft]

I connect to T-Mobile 5G auto and my APN is isp.mb.com on my iPhone 16.  I keep trying to change it to SP.MB.COM and it says my phone should automatically save this but it keeps going back to isp.mb.com.  I seem to have data intermittently but not all the time.

[computergeek541]

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@Glasgow wrote:

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Could be a SIM profile limitation—some SIMs default to isp.mb.com and won’t retain manual changes without re-provisioning by the carrier.
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APN settings aren't saved on SIM cards.  They are saved on the device itself.

[Glasgow]

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Could be a SIM profile limitation—some SIMs default to isp.mb.com and won’t retain manual changes without re-provisioning by the carrier.
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[softech]

@Wholcroft 

try Reset network settings on your phone

And try your sim in another phone if you have physical sim

and if you need further help, ask PM support agent to reprovision the account:

1. Open ticket via Chatbot (need access to My Account): At https://widget.telus.tiia.ai/publicmobile/publicmobile.html
    Start by typing "Submit a ticket", then click "Contact Us", then "Other", then "Log In", finally click "Click here to submit a ticket ↗" 
2. If you have trouble with Chatbot or you don't have access to My Account: Private message CS Agent at: 
       https://productioncommunity.publicmobile.ca/t5/notes/composepage/note-to-user-id/22437
**Monitor your Community inbox (envelope icon on the top right) after ticket submitted, CS Agent will reply to you there

[Wholcroft]

Thank you for this info.    I have tried working through the three providers and changing to LTE.   I still haven’t been able to have cellular service in the USA.   I have ensured my VoLTE is enabled and put my data limit to standard.    Hopefully I will be able to find a selection that allows me to have cellular working.

[softech]

@Wholcroft 

you don't change the APN on iPhone.  The APN there is for hotspot only

Critical part to US roaming depends on T-Mobile/AT&T/Verizon coverage and whether you can connect successfully onto one of these networks.

If the phone is not connecting to T-Mobile/AT&T/Verizon, change the Network Connection from Automatic to Manual and select and test each of the three and see which one you can connect and work best

If your issue is with data, make sure your Roaming Mobile data is enabled and you have disabled your mobile data limiter.  Also change your network mode to 4G (and don't try 5G until you can connect and works on 4G)

If your issue is with voice, make sure VoLTE is enabled on the device setting.  And if it does not work, try to change the Network to T-Mobile ONLY, and change  Preferred Network Type or Network Mode to 2G and see if the calls go through.
Also, you can download VoIP app TextNow as a workaround to make calls and text if you have Wifi or if your roaming has data component and data  is working