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3 and 7. With 3 you can essentially walk through walls, and with 7 you will know exactly which boxes you don't need to check when looking for something.
Getting powers and immediately offing yourself by phasing into a wall
Not how I wanted to become a stud, but I'll take it
Unfortunately most walls are thicker than 7" when accounting for decorations, furniture, trim, etc. Not to mention adding your own thickness.
Do you live in the US? If you're European, American walls are essentially glorified paper and are pretty thin.
America.
2x4 studs are 3.5" deep. Even interior walls have drywall on both sides, usually over a half inch, but even half inch drywall, tape, mud, and paint, gets us to 4.5-5" thick.
That gives you a 2 inch "buffer".
Is your body thicker than 2"?
There's just no way it works.
OP never defined what happens when you teleport within objects, so it could still be fair game ÂŻ\_(ă)_/ÂŻ
EDIT: trying to fix my shrug
Very very thin walls, depending on how the 7 inches is calculated (like from your center of mass or from the outer boundary of your form? Do your clothes come with you? Etc)
Only if you're less than 7 inches across in the direction you're teleporting. This is only useful for the super-skinny, otherwise you're going to splinch yourself into a wall.