Bye-bye Maxx.
Port out Maxx S$10 5G Plan to CUniq S$9.9 4G plan to try out roaming in China with China Unicom network. It has pretty good 20 GB China data bundle.
Looks like the M1 Port-Out quota thingy is over as it seems to take only one day to port out from Maxx to CUniq.
Eight 4G S$8 plan -- China Mobile as roaming partner, free voice roaming, only 2GB China Data but maybe good enough for one week visit. Cheapest to keep as a secondary number.
SIMBA "5G" S$12 plan -- China Telecom as roaming partner, free voice roaming, 18 GB China roaming data. This may be the best choice among the four for China Roaming but probably the worst for local usage.
CUniq 4G S$9.9 plan -- China Unicom as roaming partner, 20 GB China Roaming, no free voice roaming.
Maxx 5G S$10 plan -- China Mobile, China Telecom and China Unicom as roaming partner, only 3GB China Data but maybe good enough for one week visit, no free voice roaming. This is probably the best among the four for local usage.