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If you’re looking to get the most money for your “old” iPhone, then there is no better time to trade it in.

Rumors are flying around the internet that Apple will announce the iPhone 5 on September 12, with the release date soon after that. If you want to offset the cost of your new phone by scoring the highest value possible for your old one, trade-in experts say you’ll need to lock in your trade now, before everyone else gets the same idea.

“We always get a rush of people who wait to get a quote until they have the new [iPhone] in their hands,” said Jeff Trachsel, the chief marketing officer for trade-in service NextWorth, to WPTV. “But as the volume increases, the value of your phone declines.”

So if you want the most in return for your current phone it’s time to trade in. Most trade in services will guarantee the price they offered you for 3 weeks to a month. So you don’t even have to go without a phone. So what’s stopping you?