Stores like Best Buy , Walmart , and Target carry various "Bring Your Own Phone" kits from Mint Mobile, Simple Mobile, and Tracfone.

Online retailers often provide the widest variety and best budget deals.

Official T-Mobile, AT&T, and Verizon stores offer the best hands-on service. Staff will often install and activate the SIM for you, ensuring it works before you leave.

How to buy a prepaid SIM card for tourists in the USA - Holafly

You can find basic SIM kits at 7-Eleven , CVS, and Walgreens, though selection is usually more limited.

Most international airports have kiosks or vending machines in arrival halls. While convenient, these are often more expensive than city locations. Top SIM Kits & Online Options

Buying in a physical store is ideal if you need immediate setup assistance from a specialist.