it should because all sim cards are the same (well within your compny like tmobile sprint and others).
Yeah i think you can use the same sim card i haven't tried that yet but it should work the same. And you can use the same sim card on different pones and it will work the same.
i dont think you can... other then put the sim card into the new sidekick....
Yes it does but it is locked to t-mobile America
Any cell phone that is unlocked requires a SIM card to work. If you own a Sidekick cell phone that is unlocked you are able to use a carrier other than T-Mobile. For this reason, it will require a SIM card to work.
Yes, your phone number will still be the same, if you pay for text or internet, it should work also, if its doesn't you can try a hard reset i have a sidekick lx and going to a sidekick 2008.
I am sure is will work in Ireland. Why would't it. But I think you might have to change to an Irish sim card, network. Like meteor or 02 or vodaphone.
Yes you can. You can put any tmobile sim card into any tmobile or unlocked phone and it will work perfectly. Although you may need to add some features to your plan :)
yes it is compatible, if u have a GSM sim card then it will work.
is needed
No it will mess up your sidekick 1 id 2 3
No, sorry dude only the sidekick3,sidekicklx's,and08>
only calling and texting would work