I switched DD13 to a Tracfone smartphone. I find it confusing but she gets along on it okay. The minutes are done differently. Say you have 1000 minutes when you change phones. Previously that was all in one bucket and texts took .3 minutes. With the smartphone, you will now have 1000 minutes of talk, 1000 texts, and 1000 MB of data.
It has not worked out too well for DD13 to have a whole minute taken away for each text. Basically she is getting 1/3 the text allowance she used to. And I've read you can't go back to a dumb phone after you switch. I'm not sure what I'm going to do. She has TONS of talk time left though! She doesn't use the data on it much.