I know that with the Orange prepagado plan, if the number is not used for several months, you lose the number and have to get a new SIM card and number. If I return to the states then return to the DR in a few months would adding credit to the phone while in the states keep the number and SIM card valid until I return, or do you actually have to make and receive calls on the phone to keep it valid?(you can add credit to the phone online from the states) I see on the website that a credit of RD$300 is valid for 60 days. Would keeping the phone recharged with credit keep me from losing the number when I return??