Hi how can i reset my samsung sch0i910 phone? thank you

Hello there...

Which reset did you mean?

- Soft Reset: Power cycle your handset, no data is missing.
- Hard Reset: Power cycle your handset and erase all data, rollback your device to default state (when you got it first time from the store/factory).

How To:
- Soft Reset: Press the small Reset button on the up side of the handset, near the power button
- Hard Reset:
1) Go to Start Menu >> Settings >> System >> Hard Reset >> Clear Memory >> and follow instruction.
2) or other way is: handset in power off state, push small Reset button near the power button while also pressing End & Call button simultaneously and then follow instruction appears on the screen.

hope that helps... :D