Do not ask if it's available, because it is.
For sale is iphone13 256GB used with Sprint and later with T-mobile, in very good to excellent condition with the box. ( see pictures). Adult owned, never dropped, never drowned, always kept in the case with screen protector. Battery life is 77%. Comes with the box and charging cable only ( no charging adapter).
( 2 more phones for sale from my previous plan - 12PRo 256gb and iphone12 pro max 256gb)