20-09-2016 16:48 - edited 20-09-2016 16:49
sign in to myo2 on a pc select your mobile number then click on change payment details
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My first mobile was in 1995 a CM-R111 from sony on Cellnet.
Henstridge Rural South Somerset (Full 4g 3G 2g indoor coverage) Remember we are all customers here not customer services
on 20-09-2016 16:50
You can change it by signing into My O2. You will need to set up a 4 digit pin under My Details.