Just got my PH-1 and using it on AT&T, as a phone, communication device, this phone is horrible, worst phone reception I've had on a phone in 8 years. Absolutely no signal indoors, and even when talking on it outside, because that's the only place it works, even then I'm sitting at an average - 115db, people tell me they can't make out what I'm saying, static, garbled sounding, text messages only come through about 20% of the time, phone doesn't ring when I call it, goes to voice mail, I tried every known AT&T APN, tried a new SIM card, but if I put my SIM card in any of my other non AT&T unlocked phones it works fine in my home, at work, in the basement of our building at work. Tried everything, factory reset, network settings reset, new SIM card. I like the phone nice build quality, nice software, current updates but it's useless as a communication device for phone calls and text messages.
Oh, also Essential support is about as useless as this phone is now. The phone was bought new/sealed but I, unfortunately, bought it from a retailer on eBay, not an individual but a small company with an eBay store, so I saved a little money buying it there instead of Amazon but I'm probably going to lose $75 in return shipping and restock fee. Lesson learned I guess.