I currently use cricket and am considering buying a fully flashed phone. My understanding this is that 1 is an older Verizon phone...the other I am not sure

I know that Cricket used CDMA but someone said be sure the phone is 850mhz and someone else 1900Mhz. I use the phone for making calls only and maybe 2 texts per year. VERY basic usage,

Is there a big difference between the 850mhz and 1900?

What should I look for before buying either phone? I know the old cricket phone I had was tri-band. I understand NOTHING about band strength so ANY info would be appreciated

I know some of the pitfalls with a fully flashed phone but I am tending to lean in that direction because of the phone. Motorola RAZR V9M as opposed to the RAZR V3M

Any hints...info..or suggestions would be welcome and appreciated.

Thank you for your time and assistance in this matter.

Respectfully
gshock12