In order to use the Apela network services, you must have an unlocked GSM device (all AT&T and most T-mobile unlocked phones will work). If you run into problems, give us a call, but start first by trying this configuration below.
Here are the steps to get the correct setting:
Make sure roaming is enabled and turned ON in your settings, at least temporarily while you adjust the APN.
Check to see if your APN (Access Point Names) settings match the below:
Turn the roaming OFF or to your desired settings, if you want it enabled.
Here is a related article provided by AT&T:
Not sure how to find and adjust your APN settings?