No. 3G and Bluetooth use different types of signals, so they cannot be used together. However, you can use Bluetooth on your computer to use the 3G connection on your cell phone.
Wi-Fi, Bluetooth and 3G (for 3G models).
yes
Do mutitasking,bluetooth
A 9.5" touchscreen, bluetooth, wifi, 3G (on 3G models) and 16, 32 or 64 GB of storage.
The iPhone 3G has Bluetooth and so will the 3Gs model too. I do not know if the 2G model does though.
No you cant, games can not be sent via bluetooth between iOS devices.
No, it only supports Wi-Fi and Bluetooth.
WiFi and 3G
yes, there is and you should note that apple gives you details how to run all the bluetooth properly, but not all of the bluetooth works right with iphone 4, occasionally you buy a bluetooth add-on and it is for the iphone 3G or for the iphone 2 or 1.
Yes it can connect via WiFi, bluetooth, wireless data 4Glte and 3G.
If you aren't getting any internet access whatsoever, then you should make sure the iPhone has been activated with AT&T. If you are only getting a connection through "Edge" (the letter E will appear in the top bar), then you are either not in an area that has 3G available or it is simply disabled. To make sure you have 3G enabled, go to Settings > General > Network. If the "enable 3G" button is off, turn it on. If it IS on, but you aren't getting 3G coverage in places you normally do, I would contact AT&T.
No we can't use different network 3G sim in Vodafone 3G sim.