Well that was exactly the plan but then reading the forums it seemed like you can't do that in the US. My phone is unlocked (I only buy SIM-free phones these days) and is a model which supports 4G LTE on AT&T.
I would have my UK SIM with me anyway, because I likely wouldn't be buying a US SIM until I got to the US and still want a phone. Though I could buy a US SIM in advance off ebay.
Well that was exactly the plan but then reading the forums it seemed like you can't do that in the US. My phone is unlocked (I only buy SIM-free phones these days) and is a model which supports 4G LTE on AT&T.
I would have my UK SIM with me anyway, because I likely wouldn't be buying a US SIM until I got to the US and still want a phone. Though I could buy a US SIM in advance off ebay.