Bought a new Asus ZenPad Z8 from Cargo Largo. Came with SIM card pre-installed. It won't let me buy any data with out already having a cell account with them (must enter my cell number to continue). Went to the Verizon store and the ******* there didn't know how to do it either. Their website wasn't any help. Just need small amount of data for an area with no coverage on my T-Mobile network, but good Verizon coverage while we're on vacation. Any ideas?