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i bought xperia p two weeks back, from three days my phone suddenly shows no service if i swicht off and on it will normally. how to fix this problem?
What is your build number? If it is 6.0.B.3.162 then its a known issue. Do this.
Turn off your data, auto sync, wi-fi, bluetooth, gps. Now switch off the phone and then switch on. You will be now in network. Dont turn on the data. Because once u turn on the data your network will drop. SONY will be releasing a fix for this issue in Aug. Till then we have to manage without data. 
Sadly, another gingerbread update will be released early august and no ics.