The iPod touch is missing:
- GPS
- Bluetooth (iPod Touch 4G has Bluetooth)
- Cellular network
- Camera (iPod Touch 4G has front and back cameras)
- Microphone (thanks John Topley) (iPod Touch 4G has headset with microphone)
- Vibration
- The 1G is lacking a speaker
On the plus side it weighs a bit less and is a bit smaller.. Other than that they are pretty much identical (no sarcasm here; it still has the same processor, OS, control system, and display) Personally I would get an iPhone, as you will probably end up getting one later on anyway. I have an iPod touch (bought first) and an iPhone. I never use the iPod anymore.
The iPod touch is obviously cheaper than the iPhone, and there is no contract necessary. However, at least in the UK you can get a contract-free iPhone, and you should be able to do so soon on AT&T in the USA.
There are no extra costs besides the $99 for application development (which is a yearly fee)
We are developing from the UK. One issue to be aware of when you eventually sell your application is tax withholding - Apple will retain 30% of your revenues. There are some forms you need to fill out - I dealt with this in another thread. Here's what I wrote there:
You need to fill out a W-8BEN and give it to Apple to avoid a 30% tax withholding. This requires that you have a SSN (Social Security Number). If, and only if, you do not have an SSN, you may supply an ITIN (Individual Taxpayer Identification Number) or an EIN (Employer ID Number).
To get an ITIN, you need to fill out form W7 and submit that to the IRS.
You can use the UIDevice class like this:
NSString *deviceType = [UIDevice currentDevice].model;
if([deviceType isEqualToString:@"iPhone"])
// it's an iPhone
Best Answer
The iPhone uses a technology called A-GPS (the A stands for "assisted"), whereby the the cellular network and WiFi networks assist the GPS chip in determining your location. Depending on your location, this might result in a more accurate triangulation of your position.
While the iPod touch can't use GPS satellites or cellular towers to determine your location, it can use WiFi, so thats how your iPod touch knows where you are.
As far as the CoreLocation APIs go, there shouldn't be a difference between the devices, however accuracy will probably be lower and less consistent on the iPod Touch.