After unlocking your HTC S620, you will be able to use the phone on any network worldwide without any restrictions. So you will be free from those expensive contracts and if you are in another country you can use a local sim card and save on roaming charges.
Please check the correct tool by using the IMEI widget provided below and then proceed with the order.
Press *#06# to get your IMEI number.
Enter an IMEI and find whether an HTC tool is available for your phone !
After the payment, your unlock code along with the instructions on How to Unlock will be delivered instantly to your mail. Alternatively you can find the instructions on this page.
You can contact as via Email and Phone. For further queries related to unlocks, please visit our Forum.