HTC PPC-6800 Smartphone "ring sleep mode phone" Questions

...ring nor the call is displayed on the missed call list & sometimes even i dont receive SMS i need to restart the phone i have changed my sim card couple of time but in vain When my phone is in sleep ...

SLEEP mode. Fortunately I press power button. Then it starts to play ring, otherwise it doesnot play tone. Please help me, how to get rid off this problem ??? Hi dpramanik, even i had the same problem

...sleep mode You want to make sure your callforwarding is on. Sometimes when you select sleep mode, the calls will divert directly to Voicemail. Plus, ensure you have signal. Without signal, by default ...