Glad I stumbled onto your thread while posting mine. My mom was having the same issue. I suspected that since Dish Network bought Ting and decided to use AT&T instead of T-Mobile as their carrier, they were making T-Mobile SIMs not work as well. Try calling their customer service (which is great) and request a new SIM card. Getting one that is AT&T based should fix your problem. Since my mom had a OnePlus phone that was T-Mobile branded, I just found her a comparable plan with them and switched away from Ting.
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