You will need a 3.5mm Audio Earphone Headphone Microphone Adapter for Apple iPhone 3G to plug in your headphones.
The headphones will fit. Both phones have 3.5 mm headphone jacks. Almost every pair of head phones is 3.5 mm.
While the iPhone headphones will transmit sound when used with a Samsung Galaxy S4, the buttons on the headphones to adjust volume and advance the tracks will not function. If this functionality is important to you, you will need to purchase a pair of headphones that is more compatible with the Samsung Galaxy.
No. Some iPod's come with speakers such as the iPhone, iPod Touch.
Apple Inc develops and designs iphone 5 headphones together with the smartphones.
Yes
Yes
As far as i know other headphones are uncompatible with the ipad the only ones that have headphones with them is iphone or ipod
You can use Normal PC headphones and speaker too and Iphone/Ipod headphones will work too
The accessories that available for the iPhone 4 is headphones, adapters, USBs, Ethernet, the key board desk top stand and you can also purchase the covers.
Any regular headphones with 1/4" jack adapter
Yes