As DrNewcomb said, Tmobile or even AT&T should be fine for just calls. Actually, I think AT&T is $0.10/min and tmobile is more than that. Just visit their respective websites to see your options.
Quote:
Originally Posted by asal
Which could be the best option for a three-week holiday in the USA? Just need to make and receive a dozen phone calls (only simple phone calls!)
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile