Couchgram

Almost all Android users have an unlock pattern on their smartphones. But, when receiving a phone call you don't need to use it. All you have to do is swipe your screen in order to start talking. This can become an issue which is why Couchgram, among other things, is here. It lets you add an extra security step by adding an unlock pattern whenever you get a phone call.

Even though this is one of the main services on Couchgram, that's not all there is. You'll also get to activate a nocturnal mode that basically lets you reduce the shine on your device screen to as low as possible. This way, you'll get to use your phone even when you're at the movies, or in other situations where being on your phone is frowned upon.

Other interesting services on Couchgram include the option to customize your screen any way you want during incoming calls, or hiding your name and phone number from some contacts. You'll even get to redirect incoming calls to an instant messaging app with just a tap.

Couchgram is an interesting app thanks to which you can add another full featured layer of additional security on your phone. And as if that weren't enough, you'll even get to customize it.