Question about T-Mobile Sidekick® 3 Cellular Phone

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How do you activate an unlocked Sidekick 3?

Yesterday I got my sidekick 3 in the mail after i bought it off eBay unlocked. but now it is stuck on the activation screen.

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I have the same problem. But it says it could take up to 48 hours for the Welcome screen to appear. (Usually wouldn't take that long, usually it'll take about 1-3 hours)

Posted on Feb 02, 2010

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Posted on Jan 02, 2017

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1 Answer

Cant get my sidekick to activate


Let me start by saying I'm not an expert, but after going through a lot of gyrations I came up with a solution that worked for me. I'm sharing it here because I haven't seen a complete concise answer anywhere.
The activation problem with Sidekick Slides is common. Most of the time, people buy a Slide without realizing that you have to purchase a "sidekick plan" from T-Mobile to get it fully activated. These phones were build especially for T-Mobile, so they're designed so that you have to have a Sidekick rate plan first to get the phone activated. By the way, this applies to a new phone as well as a phone that's been activated before, but has been 'hard reset" (where you hold the R button while re-booting.. My advice, DON'T DO THIS! Because you have to re-activate the phone.
However, there's good news for all you non-T-mobile folks who bought a Slide on eBay (or from a friend etc.) only to find it needs activation. Here's the solution. If you search eBay for "sidekick activation" you can find folks selling prepaid activation kits for around $15. They include a sim card and about $10 worth of sidekick prepaid services. Buy the kit, install the sim, and go online to register your phone (registering by phone is a pain with T-Mobile). Online you have 3 plan choices: Pay By The Day, Pay As You Go, and Sidekick. Pick Sidekick, and then provide the requested registration information. When done, your phone should be ready to go and should activate within about 5 - 10 minutes. You'll be charged $1 a day and airtime for calls, so it's not cheap, but at least the phone won't go to the activation screen when you startup.
The next question is, how to unlock the phone for other networks? IF it's not unlocked you will be prompted for special code (this is different than the user-defined password that simply locks the phone against unauthorized users). It won't work on other networks until it's truly unlocked. Again, the trusty folks at eBay can help. I searched for Sidekick Slide Unlock Codes and found numerous vendors, ranging from $6 to $12, who provide permanent unlock codes for Slides. I found on that provides the code via email (others want to mail it to you) and got my code within 30 minutes. So now I can remove the T-mobile sim and put my ATT (or other) sim in and go. I should mention that some of the Sidekick features ONLY work if you have a sidekick plan, but that's T-Mobile's and Danger's devious attempt to make us miserable. Good Luck! Hope this helps! Rick

Sep 13, 2009 | T-Mobile Sidekick ID Cellular Phone

1 Answer

Tmobile sidekick will not activate


try pressing menu (the three bars) and L at the same time. i had an at&t sim card too and that worked.

Aug 22, 2009 | T-Mobile Sidekick® 3 Cellular Phone

1 Answer

Needs to be registered, been waiting 4 the activation screen to finish, been almost 3 days..


you have to go to and authorized t mobile retailer to register your phone or to activate it.

May 16, 2009 | T-Mobile Sidekick® 3 Cellular Phone

1 Answer

I just bought a Sidekick 3 on Ebay and I want to know how to unlock it for iowa wireless ( in Cedar Rapids, Ia ). Any help would be great... my e-mail is... k.tiffany36@yahoo.com Thank you.


Unfortunately, sidekick devices are the only phones T-Mobile will not or can not unlock. You will have to try and find a third party company or program that will assist you to do this.

Apr 23, 2009 | T-Mobile Sidekick® 3 Cellular Phone

1 Answer

Unlocking the sidekick slide


Go to http://digitalgoods.synthasite.com you can purchase privacy unlock and network unlocking codes for the sidekick id and other sidekicks. Great site! I bought one! :) They are more expensive on Ebay its cheaper on that site. Go to

Dec 17, 2008 | T-Mobile Sidekick ID Cellular Phone

1 Answer

Sidekick slide 3.


press menu and L together .....

Aug 30, 2008 | T-Mobile Sidekick® 3 Cellular Phone

1 Answer

HELP ME PLEASE


its might still locked try this site

Aug 13, 2008 | T-Mobile Sidekick® 3 Cellular Phone

1 Answer

Unlocking sidekick 3


take it too certified dealer or go online and type in cellular unlock region code this should give you several sites for unlock codes most you have to pay for

May 11, 2008 | T-Mobile Sidekick® 3 Cellular Phone

4 Answers

Waiting for activation


my service provider said that is because it is waiting to be linked to the internet... in order to use it as a phone until then.... press and hold down L and the menu button for three seconds...and it will unlock the phone aspect but you still have to wait the time period for internet use...

Apr 01, 2008 | T-Mobile Sidekick® 3 Cellular Phone

17 Answers

Waiting for activation


To speed up activation, hit menu + L at the same time.

Nov 15, 2007 | T-Mobile Sidekick ID Cellular Phone

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