Why does my iphone not receive group messages unless 4g is on?

When I'm at home and I'm using Wi-Fi I always turn off cellular data because I don't want to accidentally be using up my data, but whenever it is off I never receive group messages until I turn it back on? Why does it so this and can I make it so I can still receive group messages when only using Wi-Fi?

Have you tried resetting it?

  • Why don't I receive messages unless my cellular data is on? I got this iPhone 3 months ago. It's the 5th one. This constant problem is that sometimes I don't get messages unless my Cellular data is turned on. I need to fix this cause its really annoying. Like for example 10 ppl texted me on Christmas Day saying merry Christmas. On January 4 I turned on cellular data while in my car & then I got them all! And it's crazy because It had the date of Christmas & the exact time.
  • Why does my iphone5 receive text messages twice? When my iphone5 is on the lock screen and I receive text messages, unless I respond or look at it right away I will receive the same text message a minute later. Does this happen to everyone? How can I turn this off? It's very annoying!
  • Why does my iPhone receive messages late when I'm in a group text? I have the iPhone 4s with 16g (I have less than a gig left of space) and am on T-Mobile. Every single time I'm added to a new group text, my phone delays all messages sent to me. Regardless of whether it's another iPhone or if they're on the same carrier as me, none of my messages get to me until an hour or so later. Is it because I'm low on space? Or is it T-Mobile (probably the worst carrier I've ever had by the way)? Or is it the iPhone software?
  • Why does my iPhone 3gs lag to send and receive messages? I have an 8GB iPhone 3GS. It won't send messages. It can take from 3 minutes to 2 hours to send a message and same with receiving a message. I'm using iMessage. It is updated to the 6.0.1. I don't know how to fix this problem because it stops me from communicating with people.