After following this thread I purchased a Galaxy J7 Perx.....now mind you I live near the Jersey Shore and there's a cell tower on top of a water tower near me roughly less than a mile to my north.
Right off the bat the phone did the update for "Calling Plus"...okay. That took 10 minutes.
My first call to my brother(another Sprint customer) was alright, but couldn't access any data.....this is where the MSL code comes in handy!
Went into the ##DATA# debug and changed the Band priorities(25 was 1st, set that to 4th and put 26, 41, & 12 ahead of it). Second, in the Carrier aggregation settings I turned all of them on....this reset the phone.
I then tried calling voicemail and checking out some simple websites and it crystal clear and no drops at all. I'll test it out more tomorrow as I'll be going further inland.