Prepaid SIM Card USA SIM USA Canada uses the T-Mobile Network. Unlimited mobile data to use in the USA (except Alaska), 5GB data for Canada and Mexico. Unlimited national calls and texts in the USA, Canada and Mexico. Use VoIP apps like Skype or WhatsApp to make international calls. Plan on this Prepaid SIM Card USA Canada is valid for 14 days. Please send us an activation request at least 1 day before your desired start date. Activation could take up to 24 hours to complete. US Mobile SIM Card has Standard, micro, and nano SIM card sizes included. Works on iOS and android devices. You may not have optimal coverage in rural or outlying areas. Customer service available in English, French and German. Avoid roaming fees, unsecured Wi-Fi hotspots and the inconvenience of looking for a SIM card at your destination. Get a prepaid USA SIM Card, before you travel.