Had to use dual sim, both simba, in Malaysia. Use the data on my 2nd sim, set to u mobile, as celcom is slow at every location I go in Malaysia including jb...
Only bad thing is that umobile sometimes will lose network connection. But since I have 2 simba sim, my main will be auto, 2nd will be fixed to umobile manually, and if umobile sudden lose network, it will fallback on my main simba celcom.
Just tested, at same location, sitting down in open space.
Celcom is 115 down, 12.5 up,167 Ping.
Umobile is 193 down, 106 up, 35 Ping.
But loading this forum alone, celcom takes much longer. Umobile is almost instant.
Playing non intensive online game like Last War, celcom lags when tap to collect resources. Umobile works flawlessly.
This is my test results using s25 ultra, various parts of Malaysia, from Johor to Cameron Highlands to Genting.