There are many different cell phone service providers to choose from depending on your country of residence. Base plans normally just include a set number of airtime minutes that you can use each month. Many cell phone carriers provide addons to their plans that allow minutes, text messaging, picture/video messaging, email, and 3G coverage all on one phone. By determining your needs each month, you can determine which plan provides those needs at the cheapest rate. Carriers often have phone promotions that give away or sell new cellphones or PDAs at discounted prices if you choose their plan and sign a contract. Be sure you are ready to committ to a contract before signing.