Mobile phones

Hi everyone

I'll be arriving to Qatar on 13th May, as a field engineer. Anyway, my company takes care about all the lodging and internet but not mobile phone service. I was searching some info at the internet for some of the common telecom providers at Qatar, like Consolidated Gulf CO, Cellucom and others, but I'vent found any price at all of their services, just the products they have. I'd like to purchase a Nokia phone including some sort of monthly paid plan, but I really need prices...does anyone know which site or how much should I spend in a mobile phone service? And whether usually has full coverage for the entire region,???

thanks