Hi, I had a cracked screen replaced for my iPhone 6 recently and after the engineer left, I noticed that the loudspeaker and Siri was no longer working. I never had an issue with these before. I contacted the technician and he's told me that the mic should be fine b/c he tested it with a phone call, but this not the case if not all functions for incoming sound are working properly. He did not test Siri or Loudspeaker. Can anyone explain what would cause to not work on Siri and loudspeaker if the sound on calls works okay? Are they coming from different mic sources? Has anyone else come across this issue? Would be good to get any info to try to understand what the problem may be. Thanks!