I use circles.life and I find M1 network usable.
Maybe u should get a tpg SIM as backup. Also don't sign contract and get stuck with a particular Telco.
seriously is it not ALL M1 users are affected by their slow and even no 4G inside malls and etc?
besides those like me tied down by a one yr contract, still got pple wanna consider M1 now?
i can't even whatsapp in the malls' toilet.
Likewise, I was a Circles.Life (leverage on M1 network) user for almost 1 year.
Besides the usual poor signal coverage along Circle/NE Line, no major signal coverage issues.