What are some alternatives?
When comparing MagicPad and Signal, you can also consider the following products
MyChat - Secure instant messenger for any network
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Send - Instant messaging meets email (by Microsoft)
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Keybase for Mobile - End-to-end encryption messaging platform
Riot.im - Open source interoperable collaboration app.