'Ab mera number hai' was indeed the advertising tagline/slogan used by Uninor (now Uninor was an Indian telecom operator). The phrase means 'Now my number is here' in Hindi, emphasizing accessible mobile services. Vodafone used 'Happy to Help', Docomo had 'Do More', and Reliance used various slogans like 'Karlo Duniya Mutthi Mein'.