My wife has an old flip phone (a Motorola Entice). Is there a model of Android phone I can pick up used where I can simply take the SIM card out of her old flip phone and put in to the Android and still use it as a regular phone? We just want to use it primarily as a regular phone (we can't afford data for a second phone) and then use any/all data functionality over wi-fi.
I don't really care how old the phone make/model is and/or whether it can be upgraded to ICS, just that it can be used primarily as a regular phone using my wife's current SIM. I know I can't do this with my old OG1 (it doesn't use a SIM card, right?) but I don't know if it can be done with other makes/models. Is this possible? Is there such a phone?