It seems every time I find an app I want to download, the size is over 20MB and I'm not able to download it from my phone. Is there a way to get past that limitation without having to start up my computer or use wi-fi? I don't live near wi-fi and starting up my computer is such a process just to spend five minutes on itunes downloading an app and then having to sync the phone. (Please save the useless answers for someone else e.g., driving to a mcdonalds or starbucks to use their wi-fi)