Internet Data On/Off on iPhone 6s
I have just used the Starhub prepaid for the last two days, and I realized that my internet data showed 4G signed on my iphone 6s but it wasn't/isn't connected to the internet. I dug up some infor from this forum and used the restarting/*123*1#/etc, but it keeps on/off with no particular reason--mostly off though. I used another simcard on this iPhone and it works well.
Any guidance to keep the data on all the time?