if you are looking to unlock your xperia ion at&t and other networks then you can do so by code. here is a thread where you have a chance to grab a few free codes. http://forum.xda-developers.com/showthread.php?t=2079966 Check that thread on xda also take a look at www.htccode.com. Enter your IMEI no and you will get the code.
Thanks for it.. but since it is not a guarantee getting free codes people can get affordable unlock codes from any third party vendors online like Mobile-unlocker.com where we just need to get submit our IMEI number,country and network to them.. Further by the instruction they provide,we ourself can unlock our phone ourself...
