I recently switched my telco subscription plan from the regular ones to SIM-only plans. How do these SIM-only plans impact the revenue and profitability of the 3 local telcos? Before we begin, let me explain what are SIM-only plans. As the name implies, SIM-only plans only provide voice, SMS and data but do not come with subsidised handphones. The tables below show the amount of voice, SMS and data for regular and SIM-only plans for M1, the telco which I subscribe to. The last table shows the difference in the amount of voice, SMS and data between the 2 types of plans. As you can see, SIM-only plans have generally the same amount of voice but less SMS and more data than regular plans. As people seldom SMS but rely more on data nowadays, I would argue that SIM-only plans provide better value than regular plans at lower costs!......