Most iPhone user's cannot receive text from me and my NEW Note 4

Question

I chose to try the pre-installed +Messenger app from Verizon to be used rather than the fuctional default messenger. It wasn't what I expected so I switched back to the original message app. Well, that's when the issue's began with most of my contacts who use Iphone's.
I would send text to iPhone user's with no delivered confirmation text being returned as a notification. So I called them and they said they didn't receive a text. I realized the problem was a conflict with going back to the original messaging app/software.
Went to the Verizon store where I purchased the phone three times! The first salesman told me to have the iPhone user's to go into their text settings and turn on "Send MMS". That didn't resolve the issue. The second salesman called tech support and fixed the problem. Although I didn't know  was done but, it was apparently a temporary fixed because it continued to happen
The 3rd salesman had to reset to factory settings and disabled/removed the +Messenger app from Verizon.
Still experiencing this stressful issue with my Note4.
PLEASE HELP ME!
I_chingon

Answer 1

Sorry to hear that! I tend to use the default Messages app more than anything else too.
I'm curious about your issue because you said "most iPhone users..." That can make the situation a little bit tricky, but it can also be used to your advantage, because if you compare the messaging/cellular settings on one iPhone that works and one that doesn't, you will likely find your resolution. I'd suggest looking at an iPhone that doesn't receive your messages and try to make the settings match the settings of an iPhone that successfully receives your texts.
Since it only happens with iPhone users the problem is likely not on your end; it's more than likely an issue with iMessage on the recipients' phone, but you can certainly try to deactivate your iMessage account (if you have one). Deregister and Turn Off iMessage - Apple Support. Bear in mind that this tool is usually used to solve issues that are the opposite of yours (iPhone users cannot send texts to you).