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Here's a useful one if you're having problems hanging on data transmission:
*#301279# allows you to enable/disable HSDPA and HSDPA+

I'm developing an app that accesses the GPS and orientation sensors and sends data using GPRS. While in good 3G coverage it works fine, but on return from areas with no coverage, the GPRS fails to...

I should have added that I am a very old developer who still depends on the accuracy of documentation - old habits die hard!
And thanks for the link, that all looks very complicated. I took a short...

My app doesn't die after pressing the BACK key. It continues to run in the background, writing to a log file and doing http POSTs to my web site as if it were running normally. The Task Manager shows...