How to Choose a Wifi (Woops I mean Wireless) Carrier?

Voice usage: Estimate the number of minutes you need by taking an average of minutes from previous months. You can do this by simply calling customer service and asking them how many minutes on average I use each month. Keep in mind that you will be using your minutes both on outgoing and incoming calls with most plans. If you make less than about 200 minutes of calls per month or use mostly test services, prepaid cell phone plans will generally be the best choice. If you'll make more than 400 minutes of calls per month, a monthly plan is probably the best option.
Data usage. TXT messaging, browsing the internet, and MMS messaging are hardly ever free, and fees can add up fast as people use these features more often. Especially if you are downloading lots of music, ring-tones, and media. Most carriers offer both ala carte pricing: 10 to 25 cents per text message for instance as well as unlimited plans for $5 to $10 per month. Make sure you monitor your usage if you buy a package of text messages because going over can be costly.
Roll-over minutes: Before you select a prepaid plan, check the terms and conditions. Some prepay plans require minimum monthly or daily usage fees and minutes may expire after a certain period of time (30, 60, 90 or a full year). Minutes may have different prices depending upon which the times of the day, and some plans include free night, weekend, and mobile-to-mobile minutes. The best plans let you roll over minutes by adding funds before existing minutes expire.
International travel: If you travel internationally frequently, be sure to choose a carrier that lets customers "roam" without additional charge. Some carriers may charge you a small fee to roam on another GSM network but it will cost you a lot to call home to the US. We recommend UMA, Wifi, and VoIP phones in this case. Rates are very reasons able at 5 to 10 cents per minute from most SIP phone carriers.