Can I ' Reset All Settings ' on my unlocked iPhone 4s?

I want to Reset all settings on my iphone 4s because the Wi-Fi has been acting a little weird lately and it won't detect Wi-Fi that is more than 5 ft away from me so i wanted to try to reset all settings before i take it somewhere to get it fixed to see if the problem is actually the Wi-Fi Antenna. I'm scared though because my iPhone 4s is not factory unlocked and resetting all settings might block my phone.

I would restart the Wi-Fi Access point and leave the phone alone for now