I have a dual-sim OPPO FInd phone, and I have a USA SIM card with T-Mobile. For the last couple of years I've traveled back and forth to the UK, switching between US and UK sim cards with no trouble. On my most recent trip to the UK, when I returned this week to the USA, I'm unable to make outgoing calls with my USA SIM card. I've tried all of the suggestions on your web page, plus things I've found using Google. No luck. I still can't make outgoing calls.
Best answer by syaoran
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