Nobody knows these answers it seems

I. I see that the coverage maps for 1900 mgz covers Fl completely. I see that the 850mgz coverage map covers Fl completely. I know that AT&T uses these two. I also know that I can take a sim card out of a AT&T issued phone and put it in another one as long as it is GSM with these two mgz and with the exception of them wanting to sell you one of their phones, it will work without them either knowing or caring about it. What I can't find out is if I have a phone that is 1900mgz only, what am I going to miss out on, if anything, If it is not a dual band and the other band is NOT 850mgz or if whatever number of bands it has; it only carries the 1900 as far as AT&T uses, what would I be missing out on, if anything. I only do voice calls, and a very few texts, no internet, email, travel, etc.

2. I have discovered DUAL CORE, not just dual sim, not just dual standby, etc. but a phone(Chinavision wholesale) that actually has two complete sides (as well as dual sim cards) with two different keypads, displays, etc. Does anyone know if the settings are completely different also. For example can you set one side of the phone (core one) to ring, light up, etc. and the other (core two) to automatic answer, automatic speakerphone, no display lights, no vibrate, etc.

 

Ok, I am pretty sure that is correct, but I would still like to know exactly what I would be missing. Dropped call, no text, no emai, no internet, etc. The 1900 coverage map completely covers Fl

Also, does anyone know the answer to question two. Very interesting.

 

Hey, many thanks.

Assuming that the coverage map that shows the 1900 coverage area is completely covering all of Florida is correct; along with the fact that I am never going to travel; it appears that not having the additional 850 band may not matter at all.

Question two is the big one.