Visit the link and create an account. This link doesn't expire. You can use the app to exchange your crypto' and HODL or opt to earn interest on your savings.
The code is entered upon registration. The code doesn't expire. This app doesn't need to be opened to work, it works the minute you switch your phone on. It runs in the background and you earn $0.024 per SMS received.
The code is entered upon registration. The code doesn't expire. Get paid for incoming and outgoing (not more than 50 messages) SMS. Be careful with the outgoing feature it may not send all 50 messages in 1 month.