Delayed texts and missed calls
This happened to me about 6 months ago and my husband helped me find a fix, but it's happening again and I don't remember what the fix was. I have iPhone 11 Pro Max that I got last October 2020.
This seems to happen more with group texts or between people who do not have an iPhone. With group texts, I don't get the texts until hours or days later. I just received 27 text messages at 2:00am last night from group texts. The problem is I don't know when they were actually sent because the time stamp is when it was delivered to me and not when it was sent.
There are also times that I have missed calls but nothing indicated I had a missed call and if they leave a voicemail, I get that notification hours or days later as well.
I am a supervisor and since we are working remote, a lot of my employees contact me either via text or phone call via my cell, and if I am missing these texts or calls and not able to reply, that is a reflection on my performance and could put my job is in jeopardy.
My husband is also going through medical issues and if I miss a call or text from a doctor, it could be detrimental on his treatments. We also have a family group text to keep in touch with his progress and I have been missing a lot of texts from family wanting updates - they think I am ignoring them when I am just not receiving their messages.
I have tried all the fixes - restarting - resetting - turning airplane off and on - removing SIM card - turning off LTE - turning off iMessages - playing with notifications and sounds and alerts - EVERYTHING!
PLEASE HELP FIND A FIX!!
iPhone 11 Pro Max, iOS 14