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Why every time my husband uses our phone for long distance it says we don't have sufficient talk time which isn't true....U.S. Roaming Talk Booster 25 12 used 13 minutes Active

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