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I need a way to block my phone from connecting to AT&T since my service provider in Canada only has a roaming plan in the US that uses T-mobile's network. I can force my phone to lock onto T-mobile while I'm roaming in the US, but then I need to change this back to my Canadian provider when i cross back into Canada. I cross daily, so this is a royal PIA. It's a 50/50 chance which provider it decides to connect to when I cross into the US. Would be great if a developer could write a script that allows the user to exclude certain networks to be connected to in Automatic mode.

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    The SIM card you use is configured by your provider and usually it only connects to networks where the provider has a roaming contract with. Thus I would contact your provider and complain about that the SIM card chooses the wrong network.
    – Robert
    Commented Jun 19, 2023 at 19:23
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    Welcome to a Q&A site Android Enthusiasts Stack Exchange. There are existing questions related to your issue: Stop auto-selecting cellular network. Consider reading the answers there and let us know the result. Good luck!
    – Andrew T. ♦
    Commented Jun 20, 2023 at 4:49

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Suggestions, both require two sims, one for each country.

  1. Get two phones with individual sims and block roaming.
  2. Get a dual sim phone and stop roaming. Every time you cross the border, disable the other sim.
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