You must have a GPRS enabled SIM card from your preferred GSM carrier. You will be responsible for all charges billed by your cellular provider.
The included SIM has approximately $20 of airtime. Each location report is sent using one text message. Text messages cost 10 cents each. When you have used all of the time on the prepaid card, the tracker will stop reporting. You can add/check airtime by contacting T-Mobile at 877-778-2106 over the phone or add time by the web by clicking HERE.
$19.95 per month or
$149.95 per year subscription.