Thank you for your advice. Would it be advisable to purchase or top up credits before flying, just in case I require additional data roaming? ThanksThe in-flight roaming services is for the $25 plan and not the 100GB $10 plan. For Cambodia roaming, just take note to turn on data roaming options on your phone and once you land at Cambodia, turn off flight mode and you will be connected to their network and data. Just take note that data roaming needs to be turn on to work for data.