I got double credit on t mobile payg

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This is my first post so be gentle with me,I was thinking of changing my payg network to tesco,who Ive heard are cheapest.So I rang Tmobile customer services to ask for a pac code which you need when you port numbers.The lady asked why I was changing and said if I stay with Tmobile, any credit I put on my phone up to £50 they would match. So I put £50 on my phone and my partners, thus making £100 credit. Dont know if this will work every time, but its worth a try.