Internet

Common places for free internet include cafés, restaurants, libraries and public transport hubs such as airports or trainstations.

You might want to get stronger wifi transmitter for your laptop computer to catch weaker wifi signals. Computers also have stronger wifi transmitters than mobile phones.

Hotspots accessible with passwords

Many internet providers turn their clients' routers into hot spots that can be used by their customers. For example, Belgacom in Belgium has turned many routers into FON hotspots. Chances are that well connected locals know some of these access codes. Also, you can find FON routers across the globe.

Finding cafe wifi passwords

You can get the WiFi password for many establishments by checking the comments section of FourSquare. If you have an android phone you can use the app Venue Spot to get the WIFI password posted on FourSquare (without creating a account on it) near by.

It may be interesting to know how to recognize warchalking marks of WIFI.

Hacking wifi

A wifi antenna can come in handy for hacking

• KisMac (OSX)
• Aircrack-ng (Windows, Linux)
• Kismet (Linux)
• Router Keygen APK for Android and Windows

Cross border mobile internet in the EU

As of July 2013 there's a 50 cent per MB cap for cross border mobile internet within the EU.

Here's an overview of prepaid providers and their cross border EU pricing:

Belgium

• Mobile Vikings gives internet for 15 cent per MB

Germany

Bundles:

• Blau.de 50 MB in 7 days for 5 euro, you can charge with a credit card
• Simyo 50 MB in 7 days for 5 euro
• Aldi 60 MB in 7 days for 5 euro, only possible to charge with code bought in German Aldi stores

Netherlands

• Bliep.nl gives you 10 MB of roaming data in the EU for 2 euro per day, or 100MB in a week for 15 euro.