Who I have the same questioned this topic

Just bought and activated my first pre-paid device (basic phone).  I activated via the phone.  It actually gave me a number that is considered long distance for my area.  This is a problem because my mother doesn't have long distance on her land line and will need to contact me.  I already paid for my services using a pre-paid card.  Can I change the number?  If I do change it will I lose the $35.00 that I just opened the account with?    Thanks!