Motorola won't upgrade all of its devices to Android 4.1 Jelly Bean, so as an incentive to keep customers loyal to its brand, it's offering a $100 trade-in toward the purchase of a new, Jelly Bean ready smartphone. The company will accept any of 13 smartphones that won't receive the upgrade, including the Admiral, Atrix 4G, CLIQ2, Electrify, Milestone 3 XT861, Milestone X2, Photon 4G, XPRT, Titanium, Triumph, DROID 3 and the DROID X2.

Then you can choose the phone that will eventually receive an upgrade to Android 4.1 Jelly Bean and Motorola will provide a $100 credit. That includes the Photon Q, the Electrify M, the Atrix HD, the RAZR HD, the RAZR M, the MAXX HD and the Electrify 2. Depending on your carrier, you can either walk into a store for $100 credit towards your phone or your bill, or you can send the phone direct to Motorola for a $100 gift card that will arrive in 6-8 weeks. You'll need to send in a proof of purchase and Motorola's mail-in form, first, and you have just 30 days to do so.

Our gut reaction is that you can get more money using an auction site. Several sellers are listing the DROID 3 for more than $100 on eBay, for example.

[via CNET, Motorola]