I have a Sony Ericsson Xperia Play, and my data has not been working for quite a while now. I have tried everything suggested on every forum, with no success. I have tried changing the APN multiple times and that has not worked either.
When I turn on data, the 3G logo will appear at the top. However, only the sending arrow lights up, and never the receiving arrow. Sometime, if I am lucky, the receiving arrow will light up for about 0.5 seconds when the data first connects, but that is it.