SOME parents won't hear from their sailors very often.
My son began writing in boot camp, and called when they could. He called a frequently while he was in A-school, and I could call him, but the letters stopped. He isn't a writer.
Then he was stationed in Japan, and the calls stopped. I KNOW his ship has phones and email, the wives and mothers of his shipmates (in the ship's N4M group) get regular calls and emails from their sailors, even when they're out to sea.
Even when he's in port, he rarely calls. He's too busy with the Navy and his own life. Knowing him, I am pretty certain I know exactly what he's doing (holed up with his computer and video games). He called once while he was on a 4-month deployment, then again right before his next deployment. He hasn't been in port enough (less than one month in the last 7) to make a cell phone worth it, so I can't call him.
I don't hear from him at all when he's at sea. I asked him about email, and he said it was too much bother to get his password and Navy email address, too much bother to go through the security briefing for it, too much bother to wait in line for the ship's phones, and too poor call quality on those phones. Basically, he's being a brat.
My brother-in-law went two years without calling his mom, she eventually contacted the Red Cross (he transferred and she didn't know where to), and he called - from the CO's office. My husband wasn't much better, he also didn't contact his mom very often. They had their own lives, and she was no longer part of it.
It really depends on your sailor. The Navy offers plenty of ways to keep families in contact. But they can't force a sailor to use them. If your sailor isn't calling, writing, emailing, or even facebooking at least a few times a month, blame the sailor, not the Navy.