The embodiments herein relate to a method performed by a UE (103) for handling SI. The UE obtains one or multiple public keys for SI signature verification. Each of the one or multiple public keys is associated with a validity area of an access network where the public key is valid. The UE obtains a SI together with a SI signature from a network node (101) covering a cell. The SI comprises area identification information. The UE determines (103), based on the area identification information comprised in the SI, the validity area that the cell belongs to and the corresponding public key. The UE (103) verifies the SI signature using the determined corresponding public key.