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You should upgrade or use an alternative browser. I'm currently traveling. Having both my home SIM (which has a roaming block) as well as the travel SIM enabled at the same time is leading to "no cell coverage" draining over 50% of my battery life.

Is there any way I can get my phone to stop trying to find an impossible signal without disabling the SIM entirely? Annoyingly, services like iMessage are tied to phone number so turning it off leads to those services failing outright, even if the phone has an internet connection via other means.