I just used the toothpaste method on my LG "Rumor" and it worked alright. It didn't remove anything much, just made it a little bit more smooth is all. If you have anymore feedback on this it would be great. BTW, toothpaste does not ruin cell-phone screens so don't listen to that rumor!
Light scratches on a watch crystal (which is typically made of a high-density plastic) can be removed with most (abrasive-types of) toothpaste. In such a case, I put a little on the crystal and rub with my thumb in a circular motion. If the watch is waterproof I just rinse it off with water. For a phone, use of toothpaste might be the same but typically water will ruin a phone. If I used toothpaste on the lense of my phone I would be careful not to get it on any other parts. I might tape off the surrounding area with a (low adhesive) tape. If I think tape is too adhesive (i.e., has too much gripping power) I sometimes touch it to different parts of my clothing to pick up lint. The lint reduces the tape's adhesiveness with the final object.
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