cellular -- no offense, but i think teasers are a terrible bet. if I don't feel that a play can cover without teasing, then I don't play it. But I see people that claim that they win on teasers a lot, and I am not here to deny their success.
The only time I can see using a teaser to be very effective is when a game is floating around three and you like the favorite. I have no stats to back this opinion up, but I would think moving the line across to catch a few points instead of giving a few would be beneficial.
Good luck with your plays.