Tether really gave me a hard time to configure these two wild animals. Tried for 4 or 5 days, months back. After that used my old friend Nokia 3500c. Which was a charm to setup. No extra settings needed. Just pair with system and mention the APN and boom. You are connected.
But today I have managed some free time and decided to give another try for it. I was getting tired of chancing sim from one set to another. Some search and reading. After which came across these links one after another and finally got a working solution.
Main trick which I missed earlier was,
Use number: *99#
* (space) [seriously just 1 space no other character]
And boom, I am connected.
Links: (in order of appearance)
Prologue: Ohh, did I mention I have also tried the tetherberry, till evaluation period? It was really nice with some minor glitch. I did planned to buy it after this final try. But lucky me :D.