MVNOs on the VZW network have the best coverage, but you need a phone designed to handle those radio bands.
AT&T has good reach too but the phone must pass the IMEI check.
5G compatibility really helps with overcoming congestion issues these days.
Those few providers saddled with B&M stores are not great value, but depends on what you mean by lots of data.
We go through 600-800GB/mo, is that what you mean? Or is say 35GB enough?
Best to order a SIM online even if you need to have it sent to a US drop address to pick up.
Or maybe Boost? but they are likely to hammer you with sales BS in a store, and most likely you get put on TMO service rather than ATT.
eSIMs now make the process more flexible, and lots of international roaming data providers are cheaper these days.
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