Cingular and 3rd party apps are a really fuzzy area and you will get both answers on this. If you are on a BES, you have no problems. If you are on a BIS and using a 3rd party app that accesses the net via the WAP connection it can cause usage charges. Look on your features list for any lines that have a "per use", you don't want anything other than the text messaging on your feature list.
For me, I was free, no issues from July to November, then when I switch BBs, I started getting $25-50/month in charges. Ever month I would call and they would "fix the problem" and remove the charges. This month I had no data charges at all, so I think I am good again. But the latest talk seems to be that Cingular is going to stop giving credits and you either have to get an additional plan to cover the WAP or maybe get the tethering plan which is about $20-40/month.
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