How much would it cost to change my cellphone number?

i have t mobile and recently i've been getting a lot of crank calls and spam calls from automated systems is there a way where i can change my phone number? i wouldn't mind any number.How much would it cost to change my cellphone number?
It costs $15 to change your number through T-Mobile.How much would it cost to change my cellphone number?
t-mboile was 25 last time i check
sprint contract - free
From your T-Mobile phone, dial 611 free of charge. You can also call toll-free at 1-877-453-1304 from any phone. tell them you want to change your number and they will do it instantly for FREE.