Multitasking does not work on a iPhone 3G, You must Jailbreak your Phone to do that (Beaware that your phone would be very slow with Multitasking)
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no but it can do all the multitasking and stuff
There is a small chance you have no enabled 3G. To do this follow these steps. Go to Settings > General > Network and Enable 3G should be set to on. Also your area may not have 3G capabilities. In this case there is no 3G signal for 3G to work. To check 3G coverage contact your provider. Also if your iPhone is a 1st Generation and not the iPhone 3G you do not have 3G capabilities.
Yes, just go in the network settings and turn off Enable 3G.
unlocked only means it can be activated on any service, not that the phone is any better, when the iphone came out it was only available on one service, unlocked means you can activate it on any service
iPhone 3G S = iPhone 3G + Extra's
Probably because in your settings you diidnt turn on enable 3G or it's broke .and you need a new iPhone .
You must go to your Cell Phone Provider's store and set up a plan with them.
You could be using an iPhone 3G or first gen iPhone which doesn't allow multitasking because of RAM limitations. Or, you may need to update Pandora to its latest version (3.1.1). If you are using an early gen iPhone, try jailbreaking. You would need to modify a .plist in your phone to allow multitasking -- or download "backgrounder" from Cydia.
The iphone 3g is the third generation iphone , is that what you are asking
Apple invented the iPhone 3G.
Both the iPhone 3G and the iPhone 3G S support MMS with the 3.0 update.