It can be added.
But i suggest you to use a pen and paper in Real Life nd note the things down.
Because,
1. Not everyone is online all the time and when they are offline then basically these phone no.are useless.
2. People often tend to buy new phone no in ivmp.
3. It will be complicated.
We can instead have a contact list with a max capacity to add 10 or any quantity of phone nos and we can use a comand to load it like i /loadvehicle. Then we call the no according to whatever no is saved