I think for iPhone, you can do a reset with option to keep mobile plans.
For new iPhone, you can setup eSIM by selecting migrate from previous iPhone. Not sure how for android though.
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And finally, 3rd time is the charm, finally ported out of MR, back to M1. Gone full circle.
Like one of the poster mentioned, SG telcos are actually all cui 1.
Went from M1 > Z1 > MR > M1. Also have TPG as backup.
Z1 has the best 5G speed. Didn’t get airplane mode or excessive slowness, though some people have experienced it. So maybe just my luck during the few months with them.
Went back to M1 because I’ll be paying $17+ under CORI plan.
Monthly bill went from $40+ > $25 > $20 > $17