The strongest coverage and signal you can get is in Skudai, Johor Bahru area and also Pasir Gudang. You can also get fair coverage in Batu Pahat and Muar instead of other state is partially poor.
Rank 2126 of 4219 in Telecommunication
TPPS 09 A, Lot 54, Giant Hypermarket Tampoi, Tampoi, 81200, Johor