KnowRoaming has become a pretty popular service for those that travel internationally often. Essentially what KnowRoaming does is it gives you deeply discounted roaming rates in most countries and in many countries you can get unlimited data for just $7.99/day. Which is pretty low, considering most carriers will charge you by the megabyte to roam in other countries. KnowRoaming is effectively a sticker that goes on your SIM card and it remains dormant while you're in your home country. But as soon as you land in another country, it activates and starts working. It's simple, and low-cost.
Now, KnowRoaming is offering another service that is going to definitely get plenty of attention. As long as you are paying for KnowRoaming, you'll get WhatsApp usage for free. This means that it won't count against your data usage. So you can keep up with your friends and such while traveling abroad, without having to pay any extra money. Now WhatsApp doesn't use a whole lot of data anyways, so this isn't really a big deal - it's not like streaming video or streaming music - but it's still a nice feature to have.
KnowRoaming works in over 80 countries right now, and on any unlocked GSM smartphone. The only limitations are the bands that your smartphone supports. So if you are using a phone from the US, and are traveling to Asia, you may have trouble getting decent speeds since the bands are a bit different in Asia compared to North America. With KnowRoaming you can choose the network you want to use in each country. So if you're in Germany and don't like using Vodafone, or they have less than great coverage, you can switch over to O2 or T-Mobile pretty easily.
You can pick up a KnowRoaming SIM sticker from the link below. For those that have not used KnowRoaming before, you can get a credit when you open your account. Getting a sticker is only about $10 and it ships pretty quickly. KnowRoaming is actually based in Canada, and has continued to gain popularity and users. Adding free WhatsApp usage is definitely going to make it even more popular.