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Originally Posted by techiesteve@mac.com
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Does not the SIM have the account specific information on it? My unit came with two additional SIMs. I simply put the SIM from the phone I was using into it. If I used another SIM, does that not require T-Mobile's involvement to de-activate the old and activate the new SIM?
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Yes your sim is what stores your acct info (phone number) designed that way to switch easily between handsets.
You would need to call customer care (800-937-8997 direct LL or 611 from handset) and give them the new sim card number to be updated. It's ok to call from the phone with the new sim in it, just keep the credit card sized piece of plastic it came in out and they'll need the # starting with 8901 260. Once they update it the new SIM should be active well within 2 hours but keep in mind that any information stored on old sim (phonebook/contacts, SMS) will be lost of course so back it up first.
You can also go to
www.t-mobile.com and update phonebook entries over the air directly to your SIM if you're not wanting to fill it all out on the device, you can send up to 10 entries to your SIM at a time.
Hope that answers your question
