I have recently bought a sprint photon 4g mobile phone. I like this phone and it is working absolutely fine. But since yesterday I am having problems while making call. When I try to call someone, my phone reboots. I donít know why this happening. I am really very annoyed. When I use the speaker option I have noticed that the sound is broken. I had three phones and I have faced the same issue on all the three phones. When sometimes I am making a call, the phone isnít connecting and is getting hanged. I would like to hear from people regarding this. Any suggestions would be highly appreciated. Thank you in advance.