i bought the phone on 7th april 2013
1. 1308.0001
2. i use a class 6 8 gb, there's no lag
3. i had no problem with that, i gt subscirbed over (airtel)2 g.. so i don't think speed's the problem
4. i had no idea about it..
5. ebay . in has shells for around 1600.. you can get it for 100-200...