IIRC, you can add up to 5 Prepaid Refill Cards for a maximum total of $500, but you can only have 1 data plan active at a time. You have to wait until the current data plan expires before you can purchase and activate a new data plan.
Let's fix this trouble sueskj. Please contact our prepaid department by dialing 888-294-6804. They will be able to answer all of your questions as well as assist with your jetpack.
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