My phone (new Nokia Lumia 830) is not connecting to a network

[WPCentral Question]

My phone (new Nokia Lumia 830) is not connecting to a network or doesn't receive a signal even though it detects the mobile networks. What is wrong? The sim card seems ok. It is not giving error messages. It also detects the network provider (Telkomsel in Indonesia). The signal is good with other phones. It is the first time I'm using this new phone. I had the same model before and it was working fine. I bought the phone without simlock, it seems to have vodafone branding, though.

Thanks for your help

 

[Rajat Malhotra]

Is your phone an import?
Possibly the handset does not support the service provider's bands
Or
Since it says Vodafone maybe the phone is locked.