Sim only plans are about half the price of regular plans. You don't get a subsidized handset and you don't have a contract.
So this plan is really good for people who have a handphone which is still working. Then they can just call their telco and request to change to a sim only plan when their contract is up.
Alternatively, buy a cheap phone, my wife and I use XiaoMi and she uses the sim only plan.
So she bought a new XiaoMi for about SGD 150 and pays about SGD20 monthly without contract.
This new initiative for SIM only plans was started only when MyRepublic came about.
See how wonderful competition is. Due to additional competition, the existing telcos start providing better plans instead of tying up users to their expensive plans.
Previously, before I changed to my awesome SGD3 per month plan, and I still had a working handset, I would buy an iPhone and sell it to recoup some of the telephone expense. Now with this new sim only plan, I do not need to make this extra effort to sell the handset.
Note. Telcos don't really like you to switch to this plan. They earn less.
You will need to follow up with them actively to make sure they bill you correctly.
My wife just changed her plan and the telco did not bill her correctly for the first month. We are still monitoring to make sure they bill correctly.
Nonetheless, this is a good plan for those who do not need a new handset and want to save money but keep their data and talk time the same as what they are used to.