Well, I don't use SMS (have it blocked/removed from my service) don't do podcasts on it, either. When I go to bed I try to sleep!

And the computer screen is so much better for any kind of vid and it's external speakers have vastly better sound. But I do like to check the weather radar and do a little emailing. I mainly stay away from WiFi and get a days use. Of course, mine is a pre-state of the art 3G model, newer ones probably have more battery draining functions.
If you have 3 network providers, surely one has better coverage than another.

I'm on AT&T and they are fine while driving around town but not too good at home. OTOH, I don't use the iPhone at home, that's what the landline is for (works even when the cell tower gets blown down by a tornado!).

And 911 works as it should, providing the exact location automatically.
But Apple's planned obsolescence by improving the iOS (what was wrong with OS 7?!) and claiming iCloud can only work for newer models and the occasional "No SIM card installed"

warning may force me to et a newer model one of these days...