I wanna buy a cell phone.But which one is better?

I am afraid that your question is too unspecific to be answered. What kind (brand) of cell phone you need totally depends on what sort of demand you ask about your cell phone. For me, I am a crazy cell phone fan. I need a cell phone with diverse function such as reading E-book, Playing vedio, playing games, listening to music, taking high quality pictures........besides the basic communication function. So, I bought myself a N95 8G one years ago. For my dad, he only use the cell phone to make calls, he even can't text. And I bought him a cell phone with 30 $. You see, maybe you are the only one who can answer this question.

of you ask me i will tell you nokia only world largest mobile company nokia is best of all,they have variety of mobiles which suit every personality and also they have good service. also i want to say that a lot of material for nokia phones like soft wares,themes,help, is easily available on the internet which could be found without any difficulties

First you need to tell us what cell company you are going to have and second what type of plan and we will advice you if we can.