Be sure to unlock from eBay or any other third party unlocker that's got good reviews if android as it'll be cheaper. You could also just get your own prepaid plan with Koodo without a problem so there is no need to unlock unless there's a plan that better fits your needs / budget elsewhere.
I think OP needs her phones unlocked ASAP. Waiting until December 1st is not advisable.
The LG Nexus should already be unlocked. The Motorola is $2-5 to unlock on eBay. If you don't want to order the code online, go to one of those cellphone accessories kiosks in shopping malls and pay them ~$30 for the code. If you have a friend with a smartphone and PayPal/eBay account, get them to buy the code online and pay them back the pocket change.
Once Koodo blocks the phone from its network for non-payment, once unlocked, it should work on Bell/Rogers/Virgin/Fido/Chatr, but not on TELUS/Koodo/Public. For it to be blacklisted, it'd have to be declared as lost or stolen.
To the Mobile Masters and Koodo staff: I am not encouraging any activity that would deliberately put Koodo/TELUS at a financial loss on this thread. We understand that OP owns the phones (no remaining tab), her ex-husband hasn't paid the Koodo account to his name (and we can't expect OP to pay the Koodo account) and therefore OP's phones will be collections-blocked from the TELUS/Koodo network. Although it's unfortunate that OP's ex-husband's Koodo account hasn't been managed properly and is now in the rears, OP who owns these phones is interested in activating prepaid service which she will pay for with her own money, and sadly will not be able to use her phones on the Koodo/TELUS network.
Now OP's ex-husband will also lose his number, not be able to subscribe to wireless service with TELUS/Koodo (and if they're in AB/BC, probably won't be able to subscribe to TELUS wireline service, either), and will take a hit on his credit score. It is never recommended to leave a balance with a carrier left unpaid.