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Help where I can see how mb network I used and skype problem

You should always have the latest version so you should upgrade to 2.3.3 if thats available in your country. Rooting is something you manually have to do. So if you didnt do it then the phone is not rooted. The phone should be DEFINITELY better in terms of lag once you upgrade to 2.3.3 and do a hard reset via recovery mode.
 
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You dont necessarily need to root your phone if you want to upgrade it. (However if you want to root your phones for other reasons then let me know and I would provide a link to very easy tutorial).

If you just want to upgrade you should install Samsung KIES from the CD if you got that or download from their website. Then you install and open the sofware and plug your phone into the computer. BACKUP all the data. The software will automatically show the option that an upgrade is available and you can follow the instructions thereafter.


You will first need to upgrade to Froyo and then 2.3.3. You dont necessarily lose your data after the upgrade but its a good practise to backup beforehand and it is advisable to do a hard factory reset after the upgrade so that the phone functions smoothly.


If you have any other queries feel free to ask.

Regards
 
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