When in doubt, Wi-fi.

If you have a smart phone like the iPhone or a Blackberry that has internet access, and if your phone is capable of picking up wi-fi, companies are asking you to utilize that instead of the towers. The reason for this? Free wi-fi hotspots are becoming more prevalent and it also eases the amount of traffic the towers have to handle. So, you get to surf the net in more places quicker and the guy next to you can make his call with less interference.