Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White. This page aims to help users troubleshoot, fix, and seek help for the iPhone 4.
has the phone been repaired before? I would inspect the shield at the top of the phone but before that try going into settings-reset-reset network settings and see if that fixes it