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Step 1: Locate the trackers phone number that came on the credit card sized card included with the tracker.
Step 2: Visit https://tmobile.ecustomersupport.com/tMobile/gifting.aspx, refill the SIM with as little as $10 for 100 Pings or locates.
If you would like to check the balance of your SIM card you can call 1-877-778-2106 and follow the prompts.