Prepaid Mobiles

I have a boost prepaid phone and i wanna know if I buy an unlocked phone can I put the sim card in the new phone and still use it with boost.

I have a boost mobile i335 phone. Where can I get free ring tones that are compatible? I used to use myxer with my old phone, but it does not work with this one.

Were can i find another cheap boost mobile phone?
Or another w385 – boost ?
Do they have open faced with camera ?
Were can i get another boost prepaid or boost unlimited phone cheap??????????
I new this. I need 1 cheap. To use for like 20 days, while mine is n the shop !!!!!!!!!!!!!!!!!

I want a nicer phone but my dad says i have to use boost mobile service but most boost mobile phones are ugly. IS THEIR ANY KEYBOARD PHONES THAT ARE COMPATIBLE WITH BOOST?
List any phones that are compatible with boost mobile,Also list types of phones that are nice and are compatible.Plus list any phones that can be compatible and have a slide out keyboard.

I am trying to compare boost mobile to some of the carriers that have calling cards. It says $50 per month but is that $50 before a whole bunch of taxes or just sales tax like other pre-paids? Can someone who has it tell me if their bill is $50 + Sales Tax + other stuff? and how much it is? How much will my actual bill be if I sign up?>

I have had boostmobile for about a year now . I was with sprint and the bill was just to high so i switched . Anyway I have a sprint LG Rumor phone its not new the phone was only used for about 2months. now the boost mobile phone i do have is an i856 . Am i able to change my phone ? and still keep my boostmobile unlimited plan ? plzz any info will help