remove my galaxy tablet from acct and credit me for unused data, do not need the data plan on galaxy tablet
You need to call Customer Service to cancel - 800-922-0204 (Choose option 4, then say "Agent" at the prompt. That's the quickest way to get a live person to talk to). There will be no refund of "unused data", and if the tablet is in a contract, there may be an ETF for cancelling.