Iphone 4s problem with o2 network?

My iphone keeps searching for the network its been doing this every since o2 took the mast near us off line for engineering work know my iphone says searching for network even though it says i have bars and a signal i have to press dismiss alot and its starting to become annoying any answers guys? It says network lost any help guys i have to keep pressing dismiss and its really annoying

Try turning airplane mode on and off again or reset the phone

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