I just upgraded my iphone 4 to an iphone 6. Since then, I do not receive group messages, or they arrive days later. I have group messaging, iMessage, SMS and MMS all turned on. I had a friend (who also has an iphone) include me in a group text. It was over an hour ago and I have yet to receive it, but the others in the group got it.
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Thanks for your response. Data services work, I have no issues using browsers. There is no delay in MMS messages. The group texts that I did not receive until 1-2 days after they were sent were all new threads. I suspected a problem in receiving group texts, so I asked a friend to send one to me and two other mutual friends. I was standing by her when she sent them at around 1:30 pm, the others received it immediately while I did not receive it until 8:15 the next morning. She sent it from an iPhone. The recipients, including myself, were two iPhones and one Droid.