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I have an old Galaxy J7 phone.  Recently (and very suddenly), it has twice lost the ability to make or receive calls. However, I can still send and receive text messages.  The first occurrence lasted for a day.  I left the phone sitting with the battery removed overnight, and it started working normally the next day.  T-Mobile’s on line support’s solution was to replace my antiquated phone.  That may very well be necessary, but I want to exhaust other possible causes first.  Could a defective SIM card be causing this issue?

It's more than likely the device itself.  The band support for that device doesn't include a lot of bands T-Mobile is using currently and as network upgrades make their way across the nation.  You are going to see more and more of these older devices lose connectivity to the T-Mobile network.  


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