I've got a Sony Ericsson T618 that I am using with a China Mobile SIM card. Several days after setting up my service, the GPRS just stopped working. The little blue triangle above the GSM bars disappeared, and when I checked the "Phone Status" selection, it said that service was normal, but "GPRS Not Allowed." I took it over to China Mobile, and one of the service reps there changed some settings, and it worked again. I took it home, used Bluetooth to connect my laptop, and happily surfed for a little while. The next day, when I woke up, the little blue triangle had disappeared again, and I also noted that there was the "GPRS Not Allowed" message. I took it back to China Mobile, they changed some settings again, and fixed it. While I was at China Mobile, I asked them what was wrong with the phone, and they just said vaguely, "There was something wrong with your phone" (possibly intuiting that my Chinese was not going to be up to a real explanation). Also, since they spent half an hour passing the phone around trying to figure out what was wrong with it, it's possible that they didn't remember all the settings that they'd changed. I don't think that it's a general GPRS outage, as every time I take it over to them, they seem to be able to turn it back on. I took it home, and after being online for about fifteen minutes, I lost the GPRS again. (Sometimes the little blue triangle is completely missing, and sometimes it just appears as an outline.)

I tried re-setting the data communications to "GSM" from "GPRS and GSM", turning it off, turning it on again, then changing it back from "GSM" to "GPRS and GSM", turning it off, and then turning it on again, as recommended in the Sony Ericsson knowledge base, but this did not solve the problem.

I'd like to try to figure out how to fix the GPRS myself... Does anyone know what settings might be wrong?

Thanks,

Liberty