Managing staff mobile devices for the enterprise, is an access and security challenge. Hence, the mobile vendors (AT&T, Verizon, etc.), are now offering "mobile managed services", to their enterprise customers. This gives the enterprise more control and security measures, and also offers VoIP (Voice-over-IP) and "unified communications". The ability to have one contact medium (cell, email, etc), communication a message across other mediums (text to cell, landline (POTS) to cell ). Downfall for employees if unified communications is not offered, employees may be required to carry two mobile devices, personal and enterprise!