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Why not just buy an AT&T pay as you go SIM
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.
@hippy Why not just buy an AT&T pay as you go SIM*?
$45+tax from any AT&T shop, comes with 3gb of fast data and unlimited slow data.
Technically it's a subscription but service terminates at the end of the month without you doing anything. I've bought quite a few over the years with no issue.
Just make sure your phone is unlocked. UK galaxy S7 phones support AT&T 4G bands and are waterproof. Most phones should do 3G fine.
It's still worth carrying a UK SIM because the can roam onto any network so might sometimes get coverage where an AT&T SIM will ignore another network's signal.
*Verizon service is better in the middle of nowhere, but you need a Verizon specific phone for that.