I know you are busy. It is good to be busy, but do say hello once in a while.

I haven't seen you in a while! Where ARE you? Hello!

Hmm... Are pigs flying? I haven't heard from you in a while. Hello!

Just to let you know that you can call from an iPhone to an Android. Hello!

When I stop thinking about you, I start missing you. Hello! When are we catching up?