Wirelessly posted (L'neuf trois)
I'm wondering if the SIM might be on its way out. Some of the thing you've experienced like seeing SOS and "insert sim" are sometimes indicative of a bad SIM.
If it happens again, might want to try a sim from a different phone (or put your sim in a different phone) and see if the issue comes up still.
If the sim is indeed the issue, Tmobile should be able to replace it free of charge.
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