Prepaid

Well basically i cant afford my 15$ a month rn got fired before payday and didnt get payed.. and wont be able to pay in 2 days i dont mind going without phone but i want to know if my phone number will cease to exist after i dont pay or if i have a certain ammount of time before i lose the number . i have alot of people who know my number and i dont want to have to change it