Wow! I just received a text message dated 1:48PM Sat. Jan 16 in response to a text I had sent at 10:16 AM Sat Jan 16. It took till today Jan 21 at 2 PM for his message to get to me. 5 days! I have a basic Samsung Evergreen cell phone with basic nation wide talk and text based in Vernon, BC.
It could have been a problem from the other persons end as much as yours. There's no way to really determine who's at fault. It could be a network issue or a phone issue, on either side. I recommend turning off your phone, removing your battery and then put it back in to help prevent this in the future