Mobiles that can NOT be unlocked, Check before Buy

I will be adding the mobiles here that can not be unlocked from you corner shop or through any DIY software. You can still get these unlocked from your current network provider but they have conditions and charges.

This is to help users who are getting a new phone for reselling at some point or to use with multiple networks. Unless you get these unlocked / SIM free there is no point buying if you do not want to use it on same network.

Nokia
All BB5 phones can NOT be unlocked other than from the network itself.

6620
6630
6270
6280
6281
6680
7370
7710
9300
9500
N70
N90
N80
N73
All other mobiles in N Series AND in E Series

T-Mobile
Side Kick
Side Kick II

Correct me if I am wrong and suggest any model not listed here.