Q: hi! WHY MY 4S HAS NO PORTABLE HOTSPOT? IVE TRIED RESETING IT BUT TO NO AVAIL..

Requirements to have that setting:

http://support.apple.com/kb/HT3574

Using:

http://support.apple.com/kb/ht4517

What you should do is read both articles to insure that all the requirements are met. If they are not, you won't see that setting. Your carrier must support Personal Hotspot, & such must be provisioned on your account.

Then contact your carrier. All the official carriers, in the Philippines support Personal Hotspot. Make sure its provisioned on your account. Update your phone...make sure you're running the latest iOS version.