My text messages from my online scheduling system are always delayed until I activate my data plan. As I rarely use data, sometimes the texts don't come through until several days later. My other texts seems to come through no problem, whether or not I've enabled data or wi-fi. But the ones from this one particular place, the most important ones as they relate to my business ONLY come through when data is on. The short answer would be to leave data on, but I don't have much data on my plan and don't want to accidentally go over my limit. I'm using an Android phone, Nexus LG 4. Please help!