So the first part was to get him a phone. They have one that meets those needs for only $20! 

Next, a service plan. The "Real PayGo" plan starts at as little as $10.  That $10 is a pre-paid amount that will be decremented with each text/call/data use.  He'll only use it for calls/texts with me and my wife and will not use data. At a cost of only $.02/text, $.05/min voice & $.10/mb data, that would take a long time to use up the $10!  Now, there is one small catch - the $10 is only good for 90 days from the date of activation.  But even if he doesn't use up the $10 worth of credit within that 90 days, I've effectively paid only $3.33 per month for the service!  You simply can not find a better price, anywhere! Oh, and I'm not locked into any type of contract! In fact, you don't even have to give them an SSN.