I'm surprised I havent read from the comments how funny it is: Of course I know it wasn't a true restriction, after all its a man made program; however, isn't it convenient for years T-Mobile told customers those plans had restrictions, line caps that could not be changed, saying they couldn't make changes to the plan and you would have to switch plans to add more lines.....
Yet, they are able to raise price as it fits them... Comical and pathetic.
Self imposed limitations....