Possible audio issue for Dual-SIM Nokia Lumia 630
Polish users report that some Dual-SIM Lumia 630 units are having phone call audio issue. Phone owners are complaining of no audio during both incoming and outgoing calls. It looks like there is a serious bug in the dual-SIM software in Windows Phone 8.1 affecting both the speaker and microphone. While there is no guarantee whether your device is affected or not, there is a quick procedure that will fix the issue until Microsoft find a solution to the problem with a software update:
- Turn off the smartphone
- Remove SIM and battery
- Insert battery and SIM
- Switch on the phone
If the problem exists and you have no audio, you can try to hard reset the phone. Go to Settings, About -> Reset. Don’t forget to charge your battery before the procedure.
Nokia Lumia 630 is the first Windows Phone 8.1 handset available in two variants – Single SIM and Dual-SIM. The audio problem has been found only in the DUAL-SIM model.
Source: windowsphonemania.pl via WMPoweruser