I have several devices on multiple firmware versions fir my base testing. Next I will test on friends devices because they are usually a little behind on the fi

I have several devices on multiple firmware versions fir my base testing. Next I will test on friends devices because they are usually a little behind on the firmware updates. Finally, if I am doing something that is especially version specific, I will downgrade devices from 3.1.3 onward. It all depends on what devices you plan on supporting. If you are doing something advanced with audio or graphics, you may feel that only the later devices are capable of what you want to do, so you only support the latest FW on the latest devices. That makes it an easy choice. If you are doing something significantly more straightforward, like a social networking app, you will probably want the most broad adoption and try to support all devices, meaning supporting 3.1.3. He simulator is only good to test that thins are laying out properly and working in general. It's not a very good test of device capability or even versions. I haven't checked yet, but I would be surprised if the latest sdk for v5 even supports building for 3.x versions, given how apple wants to keep pushing people forward. Finally, you should check Latest stats on original iPhone and iPod touch usage. I am pretty sure that it will fall significantly short below 3GS and 4 usage. That should be part of your decision making on whether or nit it is worth developing for those devices.