Have been with AIS for 4 years, same number and want to be able to keep it.

Was looking at the unlimited GPRS package from them, its 999 baht per month.

TRUE however have an unlimited GPRS package for only 250 baht per month.

Have had no joy at all asking the call centre for AIS about either offering a "promotion" so that their price is even remotely similar or letting me know how I can change over to another provider but keep the same number.

Anyone got any ideas / advice?

I got a True sim card with my iPhone. GRPS connection was so slow it was useless. Switched back to my trusty 12Call 30 hours for 99 baht pronto.

I used to use the 350bt/100 hours package from AIS on a pre-paid card. The data rate was usually acceptable for email. Have now switched to their 200bt/60 hours package with call rate pegged at 1.25 baht per minute to all numbers 24/7 days.

Probably depends on location. A lot of True's cell towers only offer GPRS and no Edge, and even regular gprs is not available everywhere (even though you might have voice service).

Where I am True has only GPRS (no Edge) and it performs as well as you can expect from regular GPRS. Speeds test at 40 - 60 kbps, right at the top-end of GPRS.

Not sure if the top-end gets reached when you are in Edge coverage (should be between 120 and 220 kbps)...

They are working on the ability to transfer numbers between providers, last i read it was due to be made available around October time