My children and I both have Mint Mobile in the Avondale AZ 85323 area. I show LTE on my Samsung Note 8, and so do my children on their Oneplus 7 phones. However, their Oneplus 7 phones cannot send or receive calls or text messages. When trying to call it never rings and eventually the call ends. When trying to call them from my cell phone, it never rings their phones. If we travel closer to Phoenix, their phones start functioning normally again.
Please investigate the cell tower issues in the 85323 zip code.