If I do not have a smartphone how can I get money off by using my phone number.

You can go online and register and add coupons to your phone number

You can register online from any computer and add coupons to your phone number.

I'm pretty ure you can download the app and use your number on any phone. The app allows you to download coupons to your phone. Give it a try and if it doesn't work nothing lost by trying