BlackBerry unlocking company CellfServices.com let me know that they are having a Twitter contest where you can win a free unlock code for your device in exchange for a Tweet.

Until 11:59PM EST tonight you can send a Tweet to @cellfservices in the following format, replacing the proper fields with your device’s info:

@cellfservices FREE BLACKBERRY UNLOCK CODES! IMEI: (15 digit imei no slashes no periods) Model: (ex. 8320) Carrier: (ex. Rogers)

Although this offer is only for BlackBerry users on AT&T, Rogers and T-Mobile networks, CellfServices also has discounted unlock codes for CDMA devices which you can read more about here, along with more info about this giveaway.

CellUnlock.net contacted me to offer BlackBerry Rocks! readers 1 free BlackBerry unlock code for one day only!

This offer is available for BlackBerry owners on the following networks:

• AT&T/Cingular USA
• T-Mobile USA
• Rogers Canada

So, for example, if you have a BlackBerry Bold 9000 on AT&T but want to use it on T-Mobile…now you can! Of course you would have to sign up for T-Mobile’s service but you get the point.

This offer and the CellUnlock.net page for BlackBerry Rocks! readers will expire tomorrow, March 3, 2009 at 3PM!

• Check it out: Get your free unlock code from CellUnlock.net

Unlock Your BlackBerry Storm let me know about their new BlackBerry unlocking service. You can remote unlock the Storm 9530 to be used on the GSM and EDGE network!

Unlock Your BlackBerry Storm has also provided me with a coupon code just for BlackBerry Rocks! readers to get 10% off the sale price, which is $39.99. The coupon code is BBROCKS.

Here are other services they offer for BlackBerry remote unlocking:

• Remote unlock any AT&T BlackBerry $16
• Remote unlock any BlackBerry $49
• Remote unlock Rogers BlackBerry $16
• Remote unlock T-Mobile BlackBerry $16
• Remote unlock Vodofone UK BlackBerry $45

Info for unlocking your:

• Storm 9530
  
• Other BlackBerry

The coupon code BBROCKS works for their other unlocking services too, just in case .