Tracphone (at least the way I use it) I buy a package that gives a stated number of minutes for a specified number of months, i.e. 3 months of service and 60 minutes of use, voice & text. There are many packages & variations to choose from. About the only time I need to use the tracphone is when I set up a Google account on a new machine. The vast majority of the time I use Google Voice for 2FI.
It does have a sim card. The phone # is assigned when you buy the phone, although you can transfer or change numbers by calling tracphone.
I have a landline for my conversation needs. I only use the Tracphone for Google 2FI and emergency situations where the landline is not available.
[edit] I use Google Voice when I need to text some one. The tracphones I have only have number pads like a landline, no alphabetic keyboard.