Now, the truth is that many people are in need of serious information about phones and their unlocking. This is because many have been troubled by this. Now, when it comes to telecommunications, there are two types of mobiles phones. It is either a CDMA phone or GSM phone. If you make use of a CDMA mobile phone, it means that the service providers code their settings in the phone and therefore, it can never be unlocked or work with any network except theirs. But if your phone is GSM, it means that the service providers locked it up by tying the ID number of the subscriber which is written on the SIM card to the phone’s serial number, and when another SIM is inserted into the phone, it will not work. If this is the case, then it will have to be unlocked to accept other SIM cards. Now, in American regions, some of the networks like AT&T and T-Mobile use GSM, while Verizon and...
Sprint use CDMA. But in Europe and Africa, all are GSM.
Now, for you to tell if the phone is locked or not, you have to insert another SIM card apart from the one that the phone came with and try calling the number. If it does not connect to the network and ring, then it is a locked phone. For the records, most of the phones sold with lines by network companies as promotional offers are certainly locked, but the ones you buy from the phone shops coming directly from the manufacturers are always unlocked. In some countries, they have passed laws which enhances and encourages number portability and which places laws against locking of phones. If your phone is locked, then you can open it up by getting the code from the manufacturers and entering it with some of the information about your phone is a code like manner. This can be done for you by experts if you can’t do it on your own.