Will StraightTalk work with a US Cellular phone?

I recently started using straight talk for my phone carrier but I've been using an iPhone 5, and a person is selling a 6+, but it's a US Cellular phone. Would straight talk allow me to bring it over? I know that the phone is paid off and can be unlocked.

As long as it has GSM CDMA radios it should be able to activate it all depends on the policy of the company you are bringing it over too its best to call straight talk and ask

The phone will need to be unlocked from US Cellular. It is better to just purchase a phone directly from Straight Talk then mess around with purchasing a second hand phone and attempting to get it to work with Straight Talk.