Regardless of what ATT says is their 4G/LTE coverage… my home is a wasteland. If I do not put my phone in just the right location is just the right orientation I cannot get reasonable reception.
My phones are unlocked Moto G and the newest phone is a Moto G Power 2021. I knew about the ATT Microcell but it seems that ATT has discontinued the device in favor of Wi-Fi Calling. Unfortunately, while Motorola has posted that Wi-Fi Calling is possible on the new phones it all depends on ATT.