since getting the iphone 8, i have an issue during phone calls. When on a call, the other person sometimes tells me "i cant hear you" "you're breaking up" "you sound muffled" or something similar. On one day this happened three times. On one call the other person said, turn off your speaker phone. This last a few seconds only, and when it does happen, i have usually made a movement. But recently i dont bother, and just say can you hear me now... Im taking it to the Genius Bar in Manchester next week. But i have never had an issue like this with ANY phone i have owned.