Currently the HTC Evo 4G from Sprint is not GSM but rather CDMA and so therefore cannot be unlocked. However, if you can get an HTC Evo somewhere else someday, such as Nextal (Sprints GSM division), then you can use the instructions in this post to unlock it. An HTC Evo unlocked should work on all GSM networks. To unlock an HTC Evo, it will have to be a GSM or SIM card based version of the phone.
You can sometimes get a free unlock code by calling up your current phone carrier or provider. In exchange, they will request your IMEI number, which you can find simply by typing *#06# and hitting enter or send. If they will not give you a free unlock code, then you should check out some of the unlock code websites I have provided below this post and on this website.
Once you have a working unlock code for your HTC Evo, you are ready to unlock it! Simply follow the free steps and instructions provided below and you are done!
How To Unlock GSM HTC Evo
1. Turn on your HTC mobile phone with an unaccepted/foreign SIM card in (or no SIM card at all).
2. Now, enter your 8-digit unlock code you recieved from earlier.
3. Your HTC mobile phone should be unlocked and may automatically reboot!
If you have any information about the new HTC Evo unlocked, then please feel free to leave a review or comment below. Thank you and God bless!