The only reason that BlackBerry ever thrived was because of their top notch security for both corporations and governments. Now they are switching to iPhone for its top notch security. BlackBerry sales are dying. T-Mobile signed with Apple because of this same situation. T-Mobile was seriously hurt because they had no agreement with Apple. They lost many customers over the years. They are the preferred provider for both business and the government because of their security. They rely heavily upon those contracts. T-Mobile saw the handwriting on the wall and finally signed with Apple. T-Mobile needed Apple more than Apple needed them.