You are the effected and you have the right to complain....however technically the mobile move to voice box or broadcast the powered off or cannot be reached message when it is out of network.

Vodafone have issues related to 3G in quiet a lot of patches within Doha and am not sure if is extended outside Doha, so be sure not get trapped, do the following until you are sure that the 3G is restored properly in your common areas.

Go to Network /connection/setting and chose the Network mode as GSM or preferred GSM in lieu of 3G and or preferred 3G, and then the mobile will re boot and you will get the network again……Hope this helps.

However this implies to the phone supporting 3G network mode and most of the good phones are 3G based regardless of the video call camera available or not..

Good Luck