The Prize Draw is open to all UK residents aged 18 years or over, except employees of giffgaff, their families, agents or any third party directly associated with administration of the Prize Draw. And the winners will be chosen by random draw, performed by a computer process on 03/01/2019.
Good luck to everyone today!
How do I know if I won?
As @chris_j_b has said in the T&C,s
9. The winners will be notified by email or SMS (using details provided at entry) before 10/01/2019 and must provide their PayPal details (if they have won the £1,302 prize) to claim their prize. If a winner does not respond to us within 14 days of being notified by us, then the winner's prize will be forfeited and we will be entitled to select another winner in accordance with the process described above.
Massive congratulations to all the winners
9. The winners will be notified by email or SMS (using details provided at entry) before 10/01/2019
And according to a reply Chris posted in Help & Support, notifications were sent out to winners last week.