I have the R800a model of the Xperia Play, running 2.3.4, stock standard and not rooted.
I'm experiencing some very strange behaviour when I turn on wifi hotspot tethering on my phone. When I do, it seems some 3G functionality in the phone is lost. I can still browse the web in Dolphin Browser, but TuneIn radio stops working completely, saying there is no connection. As soon as I turn wifi hotspot off, it picks up the connection again, but if I turn it back on...bang, drops out.
For the record, devices connected to the hotspot, such as my Nexus 7, can access all online functions, including TuneIn radio. It's only the phone itself that seems to lose this functionality.
It seems unlikely there is a bug in TuneIn radio, because I've had a friend verify that it works on his HTC phone when wifi hotspot is on. I haven't verified if it's happening within any other apps but it does look like the inbuilt wifi hotspot functions in this phone are blocking some 3G connectivity while active.
This one is stumping me. It's quite annoying me because I enjoy listening to the radio on the train, but I can't do it on my phone if I'm browsing the web on my Nexus 7.
Does anyone have any clue about what's going on here?