Smart Phone for Seniors

[mommy2twingles]

Trying to help my parents purchase new smartphones.  They are switching to the TMobile senior plan and need new phones.  No deals with Tmobile.  They would like smart phones but do want to spends hundreds or thousands of dollars.  Basically it needs to make calls and do a small amount of web surfing.  I also need something that will fit an Otterbox or similar heavy duty case as my dad tends to drop his as a truck driver.  Any thoughts on Nokia phones or something else that would work under the $300 mark?