Manual for a T-Mobile,Sidekick 3,

You shouldn't need a manual for the Leka mobile because it comes already in one piece. If it is in pieces you should return it because yours must be broken.

You can download the User Manual from here

http://www.manualnguide.com/download/manual-guide/t-mobile-sidekick-3-users-manual.html

To unlock the Sidekick 3 from T-Mobile Network lock,you can use the Unlock code,You can get the Unlock code from here
Unlocking4u and get the free unlocking instructions below and Unlock it step by step...

Sidekick 3 Unlocking Instructions Warning : Do not enter any wrong unlock codes on your Sidekick 3 mobile phones. If you enter over a certain amount of wrong unlock codes on your Sidekick 3 mobile phone, your phone may get hard locked and sometimes become unusable.
1. Switch ON your Sidekick 3 with a Not ACCEPTED SIM Card.
2. If your Sidekick 3 asks for a PIN code, then enter your SIM card PIN and press OK.
3. Sidekick 3 will ask to enter an "unlock code".
4. Enter Unlock Code we send to you.
5. Your Sidekick 3 is now unlocked.

http://support.t-mobile.com/knowbase/root/public/tm30194.pdf?&A2L.SERVICE=Manual

That link will take you to the manual provide by tmobile

Here is the link to the manual

http://support.t-mobile.com/knowbase/root/public/tm30131.pdf?&A2L.SERVICE=Manual

To fix the back cover removed issue, take a piece of folded up paper and stick it between the battery and the back cover. This will keep the battery seated.

unfortunately the sidekick 3 does not allow you to change the language other than to spanish. have to then upgrade that to the sidekick lx to use that feature

Try these sites:

1) http://gsmserver.com/search/sidekick%20ID%20%20install%20drivers.html
2) http://www.manualnguide.com/download/manual-guide/t-mobile-sidekick-3-users-manual.html
3) http://www.gsm-server.eu/search/manual%20v171.html
4) http://www.ec21.com/ec-market/sidekick_unlock_code.html

Try these sites:

1) http://gsmserver.com/search/sidekick%20ID%20%20install%20drivers.html
2) http://www.manualnguide.com/download/manual-guide/t-mobile-sidekick-3-users-manual.html
3) http://www.gsm-server.eu/search/manual%20v171.html
4) http://www.ec21.com/ec-market/sidekick_unlock_code.html

Try these sites:

1) http://gsmserver.com/search/sidekick%20ID%20%20install%20drivers.html
2) http://www.manualnguide.com/download/manual-guide/t-mobile-sidekick-3-users-manual.html
3) http://www.gsm-server.eu/search/manual%20v171.html
4) http://www.ec21.com/ec-market/sidekick_unlock_code.html