Is mobile phone unlocking safe?
Phones are designed with unlocking in mind. Having said this, not all methods used to unlock handsets achieve this in the way the manufacturers intended.
As a rule of thumb, if you're typing in a series of codes to unlock your phone this is likely to be a safe method.
As soon as you connect your device to a machine or software built by a third party you run the risk of changing settings deep within the phone which may affect its usability.
Finally, using a special SIM to unlock your phone may involve physical damage to your SIM and your phone, rendering them unusable or in urgent need of repair/replacement. While unlocking is not illegal, some methods may be dangerous.