Cleaning old iPhone

[The Entertainer]

i'm trying to clean up my old iPhone so i can sell it. I already did a reset on it, and all the information seems to be gone, with the exception of my phone number. How do i get that out. Should I just remove the old sim card?

all answers are welcomed

 

[iphone blondie]

If you remove the sim card your phone number won't show anymore.
The number of the simcard inserted will show.