CAIRO: In an attempt to accommodate a growing number of mobile phone users, Egypt's National Telecommunications Regulatory Authority has decided to add an 11th digit to all current 10 digit phone numbers. Current 11 digit numbers will also change. The change goes into effect today, Thursday, although there will be a four-month grace period during which both the old and the new numbers will work. The new digit will be added after the ‘01' at the beginning of each mobile number, and the added number is different for each of Egypt's three mobile providers: 2 for Mobinil, 1 for Etisalat, and 0 for Vodafone. According to a report by the government-run Central Agency for Public Mobilization and Statistics, the number of mobile phone users in Egypt increased by 22.2 percent in 2010, reaching a total of 59 million users. To determine which number should be added to any old mobile number, see the list below: Mobinil (old - new) 012 XXX XXXX - 0122 XXX XXXX 017 XXX XXXX - 0127 XXX XXXX 018 XXX XXXX - 0128 XXX XXXX 0150 XXX XXXX - 0120 XXX XXXX Etisalat 011 XXX XXXX - 0111 XXX XXXX 014 XXX XXXX - 0114 XXX XXXX 0152 XXX XXXX - 0112 XXX XXXX Vodafone 010 XXX XXXX - 0100 XXX XXXX 016 XXX XXXX - 0106 XXX XXXX 019 XXX XXXX - 0109 XXX XXXX 0151 XXX XXXX - 0101 XXX XXXX