Change network but keep phone number

[Amirah]

I want to change my sim providers to 3 from o2, so I tried to call o2 to tell them and they just hung up on me and didnt call again so when I tried to call again they said they can't help me... what do I do and how do I change the sim and keep the current phone number 

[Bambino · Accepted solution]

@Amirah See this guide. Scroll down to the section that applies to you: Migration & porting into O2 - O2 Community