Samsung Galaxy S3 4G I9305 data:
Other names :Galaxy S III LTE
GSM frequencies :850 900 1800 1900
Standard UMTS :850 900 1900 2100
Type :Touch
Dimensions (W x H x D) :136,60 x 70,60 x 8,60 mm
Weight :135,00 g
Main display :Color / Super AMOLED
16M colors
720 x 1280 px (4.80") 306 ppi
Talk time (max.) :2G: 1300 min. (21,7 h)
3G: 650 min. (10,8 h)
Stand-by (max.) :2G: 900 h. (37,5 days)
3G: 750 h. (31,3 days)
Standard battery :Li-Ion 2100 mAh
Internal memory :16 GB
RAM memory :2 GB
Memory cards : microSD, microSDHC, microSDXC (up to 64 GB)
Operating system :Android 4.1.1 Jelly Bean
Processor :Samsung Exynos 4412
Processor clock :1,40 GHz
How to hard reset:
Warning! All data will be lost after hard reset.Please make backup first.
1.Power off your phone
2.Press together volume up + home button + power button until you will se Samsung logo on the screen
3.Select with volume buttons "wipe data/factory reset" and press power button to confirm
4.Select "yes" and press power button to confirm
5.Wait until format is complete
7.Press power to confirm "reboot"
8.Wait until the phone restarts
That's it!
Here is video how to do: