I think it's overkill.
The Dallas Cowboy's defensive lineman Greg Hardy was suspended for four games, too. His offense?
"According to the judge's ruling, Hardy beat Nicole Holder in his Charlotte apartment and then called 911 in an attempt to cover up what he had done. Holder testified that Hardy threw her in a bathtub, dragged her around his apartment by her hair, ripped off a necklace she was wearing and tossed her onto a futon that was covered with rifles, the Charlotte Observer reported."
That's two counts of domestic abuse, which could have carried a 60 day jail sentence (Hardy is appealing the verdict).
I think destroying a cell phone is much less offensive than that.