The O2 XDA Exec mobile can be bought directly from O2 stores with or without a monthly contract. If you wish to use a different carrier you may look for the phone on an auction site such as eBay.
I'm sorry. I can't understand you and your geeky vocab.
An XDA is a PDA with a phone.
One can find full phone specifications on O2 XDA from the following sources: GSM Arena, Welectronics, Softpedia, My XDA, XDA Developers, Fixya, Cnet, File Save As.
There are many different companies the produce O2 XDA phones. An O2 XDA phone is a device that runs on Windows Mobile. Some manufacturers of O2 XDA phones are HTC, Erima, and Quanta.
Xda-developers was created in 2003.
u get administrative priviliges like u can over clock your phone, install custom roms etc...for more consult xda-developers.com
Android Market is now Google Play. If your phone didn't come with Google Apps, then you can flash GApps, you can find this on the xda developers website
I would strongly suggest to read up on rooting, and to consult the XDA Developers forum if you are to go this route. Keep in mind that modifying your phone will void your warranty, and if not done properly, you can brick your phone.
Flashing is a process by which you replace the operating system on your phone with a new one. You can find instructions on XDA-Developers on how to root and flash ROMs to your phone. Other than that, I can't help you as you have not provided enough information for me to adequately answer your question.
Yes you can That should be specified! You can by using third party programm such as Skype also if your Tab have a 3G then you can do it directly as from any phone. You can read about it int he XDA development site!
Look for JWMDIonChanger_V2.6b.cab at XDA Developers.com website. It helps/allows you to change the icons. There are also many icons there.