I have the iPhone 5c 16 GB. I got it in November at the Black Friday sale. For the past 3 or 4 months, my text messages are delayed when I send them or they aren't sent at all. It doesn't matter what type of phone I send the text too or who their mobile service provider is. It even happens when I text my daughters who also have iPhone 5c and are on my plan. I've cleared all my messages several times and powered the phone on and off several times too.