My wife's N4 is on Straight Talk AT&T and she is constantly having text fail to send, usually showing a message saying "network error," even though she has a 4 bar H+ signal. Later on, maybe 20 minutes, maybe an hour, she will get a text through. If it matters, she is using Google Voice for all calls/text and always uses the Google Voice texting app so that her Google Voice number is the phone number the receiver of the text sees.
Thanks
Thanks