, it 's likely it will create an application for that device . ' Mark the Gap ' app lets iPhone users submit complaints about poor coverage . AT & T says app part of company 's approach to marketing to customers . GPS technology included in app for either 3 ##G or 3GS to pinpoint area of problem .
' Mark the Gap ' app lets iPhone users submit complaints about poor coverage . AT & T says app part of company 's approach to marketing to customers . GPS technology included in app for either 3 ##G or 3GS to pinpoint area of problem .