Problem with iphone 5s and ios7.1.1?

Ok so i can't send messages any more i have no service, my phone says in the left upper corner: searching… ( and that for about already 2days) So i tought about activating my imessages but it also doesn't work, so someone told me to update the new version ios 7.1.1 and when he is finished downloading and i want to install the new version it says this: ( see picture). So what can i do to have my messages and imessages back or to install ios 7.1.1?
Problem with iphone 5s and ios7.1.1

Try to re install your os

Are you sure this is an iOS or iPhone problem? If there's no network on your phone then I suggest you first check out if your sim is in perfect working condition. If not then maybe you can take your iPhone to the closest Apple store. This is a hardware issue. Doubt if anyone of us will be able to help.

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