I'm personally not all that big on harassment/pranks that get a bunch of businesses involved, especially non-franchise outfits like Chinese places. What did they do to you?
This is a forum made more to discuss the legality/punishments associated with an action, not for "Is my prank funny LOLZ", so I'll address it as such.
IF you somehow got caught (bragged about it, etc, etc) you could face a few charges. Depending on how you convinced the mark to order call forwarding, you may get hit for impersonating a phone company employee. Not sure what the punishment on that would be, or how they would charge that. The Chinese place, depending on the size of the order, could take you to small claims to pay back the price of the food, the gas the driver had to spend, the driver's wages, and maybe even the wages for the kitchen crew, depending on the judge. They usually like to stick it punk assholes. Thirdly, you could get hit for harassment, since there's no possible way to prove the whole thing was an accident or a mistake.
Precautions- Don't do it at a Chinese place you ever otherwise order from, or from a phone of yours (or the business phone. You'd be fucked right there).
Don't call your mark or the Chinese place from the same public phone you're pulling the prank from. That way, there's less chance of you being seen.
I still think it's a stupid idea, but have fun, I guess.