SMS can be used and will be billed at additional cost, that is $0.05/SMS for T-Mobile and $0.07/SMS for AT&T. Voice can not be used with these SIM cards.
No Data roll over to Next Billing Cycle
The unused data in this month will not be rolled over to the next Billing Cycle.
Overage Charge
Overage means the data usage that exceeds the monthly data plan. For example, for a 2GB/month plan, any data usage over 2GB in a month will be charged overage expense. As the overage charge is much more expensive than regular data plan, please make sure to select a approriate plan. If you are not sure which plan to use, we recommend you to use big data plan at the begining. You can choose to downgrade plan if the camera does not consume so much data.
Switch Plan
Yes, you can switch the Plan you want. Please contact us to switch to new plan at least one month in advance. The new plan may require change of SIM card, and will take into effect in the next month.