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The last SIM card inserted married the phone. You can take the phone to a local provider and they have the unlock codes to unmarry the phone from the SIM. Then you will be able to put SIM in. This doesn't happen all of the time.
I can tell you that if you have pictures on them they have to be put into a specific folder to view on the phone. The easiest thing to do is format the card on your computer. After I did that the sidekick had no problems reading mine. If you ever add photos to the card from an outside source such as usb cable make sure you put the pictures in the exact same folder the sidekick camera puts them in.
once it says to enter your "special code" you hit cancel and it enables the sim pin. then you go to change sim pin, put in your old sim pin and put in a new one. then go to network settings and select "scan and select manually". once you find at&t click done and you can use the sidekick.
not sure if this works with the 2008 but its something you can try, i put a sim card in my LX and was asking for a special code to unlock the phone, well right now tmobile isn't unlocking the sidekick, but you can trick the phone into using the sim card. First go to your settings, go to "SIM Center" and click on disable sim lock, enter in whatever your sim password is (if you dont know your sim password get your PUK (pin unblocking key) number which customer service will give you if you call 611, you can change that SIM pin by typing **05*PUKnumber*newpin*newpin#) now if you wanted to change it to "0123" if your puk was 9483992 its 7-9 digits you would type **05*9483992*0123*0123# now your sim pin is 0123. (trying not to make this super complicated) it will say sim pin not accepted click ok, now click change sim pin you can type the same sim pin 3 times if you want, 0123 0123 0123 now at the top of the screen bars will show up with a white phone beside it, go to Settings-Network Options-Scan and Select Manually, the SIM network should come up, click ok when it finds it and it will connect, now you can call and text on whatever sim you have in the phone
1.your sim needs a password 2.turn off ur sidekick 3 3.place ur cingular card in 4.turn on sidekick 3 5.itz gunna ask you for a special code ignore it 6. go to settings den sim center 7. if ur sim lock is disabled jus enable it 8.den change ur sin pin to wateva you want 9.once u change it you will signals bars go up 10.go 2 settings network options 11. press scan scan select manually 12. select ur network 13. and datz it your sim iz workin on sidekick 3
if u turn it off u will have 2 do da same process again this will work with all sidekicks
just ask the phone company provider for your PUK2 AND PUK codes.
when you get them go to the jump menu dial
the passcode is any 4-8 digits you'd like, that are NOT, AND I REPEAT N - O - T consecutive.
(for example 2736 is good whereas 1234 or 9876 is bad)
if it asks your for the code again put in the PUK2 then go to settings> network options goto the "scan and select manually" button and chose your carrier.