RADIO
From the 1920's until the 1950's, radio was the main means of electronic communication. Not only was there no Iphone or Twitter or Facebook or Internet, there wasn’t even any television! Somehow, we survived. There are lots of good movies featuring the radio and here are a few.
Handle With Care (1977) is an original, celebrating the short, eventful life of Citizens Band radio (remember CBs?) with a wacky cast that congregates around it. It is one of those handful of movies that goes in completely unexpected plot directions, all of them quite delightful. 
Play Misty For Me (1971) is a complex thriller with Clint Eastwood very good as a disc jockey whose endearing caller turns out to be the stalker from Hell. Jessica Walter is fine as the femme fatal. This is Mr. Eastwood’s first directorial effort and it is assured and polished, as well as extremely suspensful. 
Jeff Bridges is a self-absorbed smart-alecky radio personality blind sided by a tragedy in The Fisher King (1991). Amazingly, he is brought back to an even keel by street person Robin Williams. Mercedes Ruehl won the Oscar for Best Supporting Actress as Mr. Bridges’ on and off girlfriend. 
Robin Williams surfaces again in Good Morning, Vietnam (1987). Mr. Williams is the GI disc jockey whose goofy radio persona is just right for the war nobody understands. Like M*A*S*H, this movie manages to combine side-splitting humor with heart-breaking tragedy. 
Radio Days (1987) is considered Woody Allen lite, but I really liked it. It bounces joyfully between 1940's good times around the family radio, and charming stories of the radio personalities America listens to. Woody and Mia Farrow head a fine cast also including Allen regulars Tony Roberts and Mercedes Ruehl. 
In Kaufmann and Hart’s The Man Who Came To Dinner (1941), Monty Wooley is the ego-heavy radio personality who breaks a leg in a middle class home and becomes the guest nobody would want. Various assorted friends and acquaintances wander in and out, to the chagrin of the “hosts” and to the hilarity of the audience. 
A film about a more modern radio show that is still very much around is Prairie Home Companion (2006), an excellent adaptation of Garrison Keillor’s famous broadcast. Though Mr. Keillor has moved on, the show is still very much alive. Mr. Keillor, Meryl Streep, Kevin Kline, Lilly Tomlin, among many others, bring the radio program to vibrant life on the silver screen. 
Other films you might enjoy that center around the radio include Comfort And Joy (1984) and Sleepless In Seattle (1993).
All of the movies in this article are available on DVD and for streaming. All except the first two are fine for all ages; those are for grown-ups only.