You have lost data connectivity because...

For me, my issue was resolved...sort of... I found that the root problem was when I was at home connecting to my Airave. The Airave does not support LTE (Which I knew already) but iwht my other phones they would revert back to CDMA to make the connection. Away from the Airave, I do not have the signal drop off like I previously described. So it appears to be a full on compatibility issue wiht the Tri-Band handsets vs. straight CDMA/LTE.

The solution, which is a pain in the *** and is what Sprint is telling everyone to do that is not in a good LTE area, is to switch to CDMA only. Again, this compatibility issue can be resolved rather easily if they (HTC/Sprint) were to put a little thought into the logic on signal priority. Instead of favoring LTE all the time is to introduce an algorythim that if no LTE signal is detected, or is below a specific level, that it would revert back to CDMA. Then scanning can happen in the background to detect a better LTE signal than previously detected. If so switch to LTE, if not, remain on CDMA. All this should be able to be done without causing all the foreground scanning casing the full signal drop/no signal like I was seeing even though a solid CDMA signal was present.

Either way, I now know what the issue was and know what I need to do to make sure I connect to my Airave. Another thing I also discovered is that there are several new towers that will be up and functioning in my area filling in the gap that I have had for several years now. So hopefully, if all goes well, I won't need the Airave anymore.
 
I have the same issue on Sprint. Technical support agreed that the phone was bad but I may go with the Samsung S5 to be safe.
 
Before reading this I thought i was the only person having connection issues with my M8. I am on phone #3 and this sucks. My wife has an LG Flex which has no signal problems while mine is either roaming or simply has no connection at all. I really like the M8 but at this rate looks like im being forced to make a change.
 
Sprint uses a CDMA network, which doesn't require a SIM card. The SIM tray on Sprint phones is purely for global GSM usage when travelling.
 

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