I repeat my earlier statement bharath063
. You're essentially asking m.facebook.com to take your
incoming connection, then reforward it to another location AS m.facebook.com. Unless m.facebook.com is
configured to do that (and dollars to donuts it isn't), you won't get your "free internet access" you're after.
All m.facebook.com likely is is a black box somewhere listening on port 80 and feeding whatever data user(s)
request of it and that's it. If "free internet" is what you're after, find another option, like using your or someone
else's home wifi, which is ALOT less hassle and time wasted than figuring out how to "hack" m.facebook.com