Developing J2ME applications for mobile phones looks like a breeze but it can really be a pain. The pain is not the development but the deployment of such applications on multiple devices.
Recently I have witnessed a lot of such issues and majority of them have to do with just either inconsistency amongst different device manufacturers or perhaps not being able to come up with a standard or just bugs in firmware implementations.
J2ME applications don't have a standard way to get network connectivity from the underlying device OS. So your WAP connection works but not your J2ME application?
And to make matters worse, the carriers have no standard way to set GPRS settings for wide range of devices. More often your device is not supported by the carrier. I sometimes wonder how complex would it be for a non-techy person like my father to get and make those settings manually.
And then connectivity issues. In India I have tried Idea, Hutch and Airtel GPRS network. I have found Idea GPRS (WAP connection) to be worst. Its just too slow to do anything meaningful.
So be sure to resolve these differences, before your customer bangs on the door!!
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