You have an LG G4? Most trade-in programmes will not give you anywhere close to the resale value of that phone. Your best bet is to sell that phone on Kijiji, Letgo or some other platform. You could sell it for $150-300 (the lower your price, the faster it'll sell).
If you had a phone that was worth next to nothing in resale value, and you happen to live not too far from a Wow Mobile kiosk, they have a pretty good trade-in program on Koodo where they'll give you a flat $50/75/100 in-store credit to use towards sim cards, memory cards, cases, headphones, or other accessories depending on their promotion.
Your LG G4 will sell for more than that for cash, I would not recommend throwing it towards a kiosk trade-in program.