Jangan biar rezeki menunggu.The idea seems to be that food is a blessing, and it is bad manners to show disrespect to it by texting while you are eating.
Don't make good-fortune wait.
Maybe the nearest similar saying in English is: Don't look a gift horse in the mouth. Except that the English version does not refer to food.
(My thanks to my UBD colleagues Salbrina Sharbawi and Malai Ayla for giving me this example.)