Recently a Spanish telecom company tricked me and it ended up with me having to pay 110 euros for one month of Internet, instead of their “normal” 50 euro per month which I usually pay. Because you need a Spanish bank account to order all other Internet alternatives here, and for that is a lot of paperwork which takes at least two days, I had no choice than to continue with the same company until I move from Spain (3 weeks later). Not only is extra costs annoying, it can also be very expensive if you for example work with Internet like me and can’t work for several days.
The bottom fact is, have backup plans!
If my Internet goes down I use an U3 USB stick with all my programs, mail, contact information and so on. This stick does not work on all older versions of Windows though, so it can still be a problem in some countries where the Internet cafes are not so modern. But you can have a simpler USB stick and use it as a normal extra hard drive. This is also good to always have with you, so if your computer gets stolen (or brakes down), you have all information on two different physical locations.
Have extra money saved for unplanned costs
This can be apartment costs, other living costs, costs for moving/traveling, fines/bribes (if you do something that you did not know was illegal), phone/internet costs and so on.
Have an alternative place to stay
When moving/traveling, have a backup plan (or at least extra money) that you can use if there is some problem with your primary living arrangement. This is also good when CouchSurfing for example. Even when you are staying put in a country, have the phone number and address to one of your new friends where you could stay for a day or two if something happens.
Always be able to get important phone numbers and documents
When living in a country where you initially does not know anyone, write down important addressed and phone numbers and hide somewhere (not in your apartment, but for example in your mailbox). Now if someone robs you or steals your things (money, keys and so on), you can at least beg for money and call people to help you. Important phone numbers can for example be police, your landlord, family members and so on. This information is also good to always have on internet, for example in your mail, along with a scanned copy of your passport, visa, tickets and other important documents. Imagine for example arriving to a new country, getting robbed and don’t have the address to your new apartment or anyone in the country.