Second contact number showing on contact card

[Oobydoobydoo]

I have my ex partners number showing as a secondary number in my contact where a second sim would show.  There is no second sim in the port. It is concerning me and no one seems to be able to tell me definitively if he has tried to hack my phone somehow. And if this could be done remotely.

Would appreciate any expertise on this place 

[Moiramon]

I have a second number showing on my contract.
Mines due to swapping phones and putting the new SIM card in. I then carried my old number over. So the top one is my old number and the one I use. The second is the number on the SIM card. The second number isn't used. You could probably try getting a new SIM card from your carrier.

[Oobydoobydoo]

Thank you. He has never used my phone and never had direct access to it. Im concerned that he has managed to do something remotely. He has already been arrested for stalking me, ive deleted it as a second contact i would like to know how it ended up there to start with.