Why does my Sony Ericsson Xperia Arc LT15a reboot itself and not even load the home screen?
Try:


Removing SIM
Restart phone then go to setting -wireless networks-more-mobile n/w-n/w operator
Here you select search mode manual then select your network in 2G mode(ex. Vodaphone 2g or Airtel2g etc). Make sure not to select a 3G network.