WhatsApp rose to huge popularity in Europe and around the world by offering a free alternative to SMS on your smartphone, but you still need a cell or Wi-Fi signal to connect. Now, one company is stepping in with a specialized SIM that promises to provide unlimited messaging for just €10 per year.

WhatSim slides into your phone like a regular SIM card, but that's where the similarities end. The company says it can connect to 400 carrier networks in 150 countries, and automatically latches on to the nearest one. For €10 (€5 in some countries) you get unlimited WhatsApp text messaging. Sending video, photos and voice messages costs extra, meaning you'll have to recharge WhatSim with credits to get the full experience.

Still, it's a pretty sweet deal, especially if you already travel a lot and generally keep in touch over WhatsApp. For now it looks likes the company is focusing on Europe, along with parts of Africa, the Middle East and South America. There's no support for WhatsApp users here in the U.S., though it's possible that could change down the line.

WhatSim isn't directly affiliated with WhatsApp or its parent company Facebook. Instead, this is the brainchild of Zeromobile founder and CEO Manuel Zanella, who's been working to lower mobile phone bills for over a decade. If you're interested you can head to WhatSim's website now via the source link below to buy WhatSim for yourself.