Chosen Solution
iPhone 5S cellular connection searching replaced charge port and cellular antenna on loud speaker also reset cellular settings removed SIM card looks normal undamaged. No liquid damage in phone or damage to phone itself cellular connection just stopped working and is constantly searching. What could be the problem? Thank You!
It looks like its logic board issue , its very common for iPhone, there are a lots of videos of how to repair it, its called baseband, I apologies as I’m only level one technician and do not have a good knowledge of logic boards issues
