Number ported from o2 but when I text out it’s coming up a different number

[ail5577]

Number ported from o2 but when I text out it’s coming up a different number

[Carley_S]

Hi @ail5577
Welcome to the community! 
Sorry to hear you're having issues after your number port. Can you confirm if you have an iPhone or an Android? 
If you have an iPhone, can you please try these steps to see if this resolves the issue. 
Settings > phone > My number > change this to your number.