Chosen Solution
So I had this iPhone 6S stored for like a year, was working fine when stored, not being used for months, and now I got a new battery, replaced it without any issues and I got random No Service, sometimes it does get 3G/4G, I can make calls, but I cannot use cellular data (ie navigate to any website). I have tried: unplugging and cleaning the so called “cellular antenna” and that antenna cable also.resetting phone to factory settingstried other SIM cardsupdating to the latest iOS Although I am still confused to what is exactly the cellular data and if replacing it could fix the issue… I unplugged and cleaned the one on the top left corner, but there’s another one near the speaker, which has the cellular cable connected. Would appreciate any help on what else to try to fix it.
Random no service issues on iPhones are extremely hard to diagnose. I am not sure which antenna you replaced but the cell antennas on the 6s are located within the red circles. Check them very carefully especially the one near the battery connector. The only other part that could be causing this is the charge port assembly. If it is not that it will be a logic board issue.
it’s the sim tray its not making proper connectivity its problem bent ever so slightly and now it works like that happens a lot really kinda sad no one has fixed the sim tray being so breakable yet but as u can see its like an optical illusion
