I wanted to keep my old number from other network but 3 has given me a new number

[Janmcb51]

I wanted to keep my old number but received a sim with new number

[JadeF · Accepted solution]

Hey @Janmcb51 

Welcome to the Three Community page. 

Did you provide us with a PAC at the point of sale? If not, don't worry, you can transfer your number over to us by following this process here. 

Thanks, Jade

[jr0]

you have to port your old number.

https://www.uswitch.com/mobiles/guides/porting-your-mobile-phone-number/