I recently moved into the 21st century as far as cellphone technology. Yes, you're right. I finally got onto the smartphone wagon.
I've been experimenting with a couple of free metronome apps for Android to help when I'm practicing music away from my piano (or sometimes, when I just want to hear something different at home). The first is Mobile Metronome. It's a nice basic metronome. You can adjust the instrument used to bang out the beats. I wound up uninstalling it because I wanted to find something that could handle hybrid meter.
I'm currently playing around with Metronome Beats. I was able to set it to play 6/8 time. It works nicely. You can also customize what sounds you hear. You can also customize the following features: emphasize the first beat of the bar, adjust the normal beat, the pitch of the beat subdivisions and the length of the sound. You can even create custom sounds to use for keeping time. Both Android apps have a "Tap Tempo" feature. I'm still on the lookout for an app that can handle beat subdivision for hybrid meter well. Stay tuned!