My iphone 5 won't make a call when i fail to connect to the internet via 3g

My iphone 5 won't call when i fail to connect to the internet via 3g.
At work i dont have wifi i have 3g, if i launch say the sky go app,or the iplayer, sometimes they work and everything is fine...sometimes they wont load as 3g for whatever reason cant get a connection at that particular time........ if i then try and make a call the call will fail. I've experimented 25 + times and this is definately the cause.
(note: when the 3g connection does work, the phone has absolutely no problem calling people)
Anyone had this problem?
Even better has anyone got a solution?
Thanks,
Nick.

Are you sure that the carrier's signal is strong where you are having this problem? Certain building structures and locations have poor cellular signal strength and this often results in the "No Service" indication. Are other users able to get service in the same locations where you have problems?

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