This is a SIM error that can be easily fixed following 4 short steps: turn off the phone, take the SIM out of its slot, put it back in and turn on the phone.
It rarely happens that after unlocking your phone, you cannot use your internet, but this can be easily fixed from APN settings.
Do I have a limited number of attempts to enter the correct code? What happens if I use all the attempts (0 attempts left)?
Generally, there is not a maximum number of code entries, but the exception is made by LG and Blackberry, which accept only 10 attempts. Nevertheless, if you own an LG or Blackberry phone and you are out of entries, please go to a local service and your issue will be solved.
Yes, it is. Freedom for ever!
No, the fact that you want freedom in using your own phone should not affect its warranty, under no circumstances. Nevertheless, a very few numbers of network providers may include a clause in the contract regarding the unlocking of the phone, thus it is advisable to check your warranty contract first.
Inserting the unlock code is rather easy and painless: you will insert the unlock code in the designed place specified by one of the next messages: “SIM Network Unlock PIN” or “Enter Lock Control Key”.
There are some cases when is no specific area for introducing the unlock code but have no fear because is a matter of seconds in getting the solution. Each phone brand and model is different, therefore see the section Knowledge base.
There are a few cases when the unlock code does not work from the very beginning but of course, there are solutions, depending on the phone model. Please see the specific solution for your phone model within section Knowledge base.