When running some SIM unlocking and bootloader unlocking processes on your Sony Ericsson Xperia smartphone, sometimes a testpoint connection is necessary to allow the process to finish. Requiring a connection between the testpoint (a small conductive area on the back of the phone) and a ground point (any exposed metal), unlocking smartphones like the Xperia Arc S and Xperia Play can be a bit confusing if you don’t know what to look for.
Take a look at the images below to easily find the testpoint on your Sony Ericsson Xperia smartphone. If you’re looking for flashing/debranding or SIM unlocking services for the same, be sure to visit SIMLOCK.com.