Very surprised with the usable speed simba provides in the sengkang east area. Used to be an eight user and it had issues using apps that generate a qr code to pay for a discount in some areas like Rivervale mall. With simba, these issues are no more, atleast not as annoying as using eight.
I remember using simba 2 yrs ago and really cmi. I suppose either there have been upgrades to the infrastructure or too many users ported out of simba
Of course, some areas like outside yishun northpoint near the bus stop, data stops loading. But I don't wait too long for the bus to come so it's not really an issue. I only transport by the bus so I can't say anything about mrt connectivity