条款与条件 | giffgaff — Terms and Conditions | giffgaff 
When switching to another network services provider, you will only be eligible for a refund of any purchased credit or any unused Plans. Credit purchased using Payback Points earned via Participation (as set out in clause 7.1a) below) is refundable when switching to another provider. We are not obliged to refund credit that we have applied to you...