No, because the 3.5 mm headphone jack is only an output jack and therefore cannot take any sounds in. Unless you actually illegally modify the ipad's current microphone you cannot add an external mic.
No. The iPad does not support external networking hardware. You can use an external broadband hotspot through Wifi, however.
The iPad has a microphone built in (next to the headphones socket). Some Bluetooth microphones can be connected to the iPad device wirelessly but not all of them will work. Headsets (combined headphones and microphones) are also available for the iPad.
The mic is right next to the headphone jack on the top left of the iPad.
no you cannot make a call on ipad as it has no microphone installed
Only if the microphone is a Bluetooth microphone.
a camera a microphone and flash
Open a recording app. The microphone will automatically enabled.
It has a microphone, so you can if you get an app for it
All models have one.
Most models of camcorders come equipped with external microphone inputs.
No it does not. An external microphone must be used. See this page to view the 640: http://support.dell.com/support/edocs/systems/ins640m/en/om/about.htm#wp1097563
The microphone on the Ipad automatically turns on when you run a program that requires the use of a microphone. If you run skype, and you go into a voice call, the microphone will automatically turn on.