Nokia C5 unlocked GSM or SIM based phones need an unlock code. Most Nokia C5′s will come with a SIM lock on them by default that prevents you from using SIM cards from unaccepted phone carriers. By removing the SIM lock on your Nokia C5 using an unlocking code, you will then be able to use your C5 with any mobile network.
You can try calling up your current phone carrier and requesting a free unlock code for your Nokia C5. However, if this does not work, I would suggest reviewing some of the unlock code websites that I have posted below. Here are the free instructions to unlock your Nokia C5:
How To Unlock Nokia C5
1. Power on your Nokia C5
2. Type #PW+Unlock Code+1# (Where Unlock Code is your 8-digit code you acquired earlier)
3. Your Nokia C5 cell phone should say “SIM Restriction Off”
If you need any help or want to write your own review of the Nokia C5, then please feel free to leave a comment below. Thanks and God bless!