I am finding that I-Mobile 3GX and TOT3G have bad service. When you can get a signal it is fast but it drops away too much and my I-Mobile sim will not roam to AIS as advertised.

How much data would the average person use in a month. I am thinking about the AIS SmartPhone 400 plan that allows 250MB of data per month. Is that enough if I don’t download large files on the phone? I know that I would lose 3G but it would be worth it for more reliable service.