I have a sidekick 2008 if i switch on the phone it ask me for a code and i dont have any idea what the code is my IMEI is 358046014104633

ur defalt phones codes is 12345 or 00000 u can use it
Default 4 Digit user code: 1234 or 0000
Default 6 Digit Security code: 123456 or 000000

Type *#06# at the mobile screen to know IMEI no of your mobile.
send the IMEI no to me and i will reply you with unlocking code.
IF Problem not Solved So
Please New Software install in the Phone Problem will Solved

If For puk & pin cod problem So Please
Very Best Solution:You Go To Service & Sim Office and Get The Puk code And Pin code From Office oprator
Enter The Puk code and Yes
Enter The pin code and Yes
So Puk code Open and Problem will Quickly Solved

Hi you can try Mobile-Unlocker to get unlock code for your Sidekick 2008 and get it unlocked from T-Mobile..

i think your phone is asking for unlocking code. you can get the special code for your sidekick slide from Classicunlocking.com

Find which Network locked now,get the code from here
Theunlockarena.com and Unlock it,Check code for Your Network Lock,Follow the instructions below and Unlock it step by step./...Instead of watching video ,you can use the safe Unlock code method using instructions Unlock it step by step...

Sidekick SLIDE Unlocking Instructions

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

*NOT ACCEPTED : We mean, to use a Sim card from a network other than the network your Sidekick SLIDE is locked to.

Well if you are tied to a particular network all you have to do is to unlock your phone to use it any other GSM network. You can get the unlock code through online. Give your IMEI number & get the unlock code for ur mobile .............You also get through online..........I will suggest the website Unlock-Zone.com which is doing good service .....you can approach this website.

Hi, First request the phone's IMEI code by contacting customer service for T-Mobile. If you've been a customer long enough, T-Mobile may send the IMEI code, or the code identifying the specific phone, in a few days.Turn off the Sidekick Slide. Remove T-Mobile's SIM card, which is located near the battery. Insert the new provider's SIM card.Turn the Sidekick Slide back on. The phone will detect the new code and ask for the IMEI code. Enter the code. Now the Sidekick will operate using the new network.
Thank you

The sidekick from T-mobile is unlock-able with IMEI or MEP unlock code, I run a mobile shop and recently unlocked 5 of these sidekicks this month. You can get your code online, its very easy and takes couple of seconds to enter the unlock code and have your phone free from restriction. Not to mention once unlocked you can use it ATT or any other GSM network. You can get your code from here.

When you place a new or a existing SIM card from another phone provider into your mobile phone and it asks for a Security code then :-
This phone is locked to the original mobile phone provider. You need to contact this mobile provider to ask for the unlock code (security code) for this phone. You need to provide proof of ownership etc and the phone's unique IMEI number which is located inside the phone under the battery. They use this number to generate the unlock code for your phone.
They should provide you with instructions on how to enter this code into the phone.
Once you unlock the phone, then you can insert a new SIM card in this phone or sign up with another phone provider using this phone.
You could ring the phone provider and ask for the unlock security code because you are going overseas and wish to use your phone with a prepaid SIM card from another country. This maybe a free service.
The other way to get your phone unlock is to use a phone unlocking company on the Internet, they usually charge a couple of Dollars for their services. Use Google and search for "Security unlocking code”.
The IMEI number is unique the each mobile phone.
The number is printed on the label under the battery.
You can also get the IMEI number by entering this on your phone
*#06# It will then display your IMEI number and you may also get a unique global serial number. Your IMEI number should be 15 digits.

Just click on the link and enter ur mobile's serial number.you will get the master code of your phone http://mastercode.nokiafree.org/

yes, tmobile does unlock the sidekick 2008 for FREE!!. i promise you this works, i just did this today, the agent told me that they dont usually advertise it.
So here are the steps.
1.call tmobile but dont ask the first representative to unlock it.
2.ask him or her to transfer you too customer care.
3.then ask the customer care agent for the SIM SUB SIBY unlock code.
4. he or she will ask you for the IMEI number, if you dont know that number, just dial *#06# or you can find it on the back of your phone under the battery. IMEI number is a 15 digit code.
this will let you use your sidekick 08 in another country.