 
 <prompt> Wetin di phone carrier group call di way e go charge dia devices? Based on di previous question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: The cellular phone carrier group Open Mobile Terminal Platform (OMTP) for 2007 don endorse micro-USB as di standard connector for data and power on top mobile devices. In addition, on 22 October 2009 di International Telecommunication Union (ITU) don also announce say dem don accept micro-USB as di Universal Charging Solution for their "energy-efficient one-charger-fits-all new mobile phone solution," and add: "Based on the Micro-USB interface, UCS chargers also include a 4-star or higher efficiency rating—​​up to three times more energy-efficient than an unrated charger." 