I want to return my iphone se which I bought yesterday I just change my mind.

[#1]

The delivery is coming today at 14:00.

Please tell me how can I return my iphone se as soon as possible.

[#2]

Go to the order history in your account and there will be an option to return it once it has been delivered (it may take a few days to update to delivered).
http://giffgaff.com/dashboard

[#3 · Accepted solution]

See the return policy here
https://community.giffgaff.com/t5/Solve-your-questions/Phone-Return-Instructions/ta-p/10441537

[#4]

 Refuse delivery and it will go back to giffgaff.