Being M1 customer, I like its unlimited free calls to three M1 numbers to local voice calls. Because of this innovative product, I have been its customers for many years. This is the power of subscription for a telecommunication company. In fact, mobile subscription is considered the most important investment moat for a telecommunication company because the motivation to switch to another mobile phone carrier is low once a customer subscribed to its data plan. However, as an investor, I would never invest in M1 shares. From almost $4.00 in 2015, M1’ share price plunged to $1.73 lately. Being the smallest player, M1 faces the biggest risk of shrinking market share with the entry of new competitor, TPG Telecom. To make matter worse, Singapore market is very small and saturated.   According to Infocomm Media Development ......