I have had the same mobile number for the last 20 years now and it feels good to be part of this select club. However, I had switched to a different mobile operator after the first 5 years. Reason? Unsatisfactory services like frequent call drops, slow internet connection and limited coverage in many areas. But these unpleasant customer experiences helped me learn something: Had my original operator provided high-quality services, I could well have stayed loyal to it for the next 15 years (and more).