A:Answer There are no SIM cards, it uses Virtual SIM to connect to local cellular towers anywhere you go. You can buy the data by the day (24 hrs unlimited WiFi daypass), by the month (30 days of unlimited WiFi) or by the GB. Speeds as 4G as long as it's available where you are, and on the Pay-Per-GB plan, it won't slow down. No contracts for any of the options, so you can do monthly if you want, or just pay-as-you-go if you'd rather