Does using a VoIP software (Skype?) on a cell phone work well?

Low-cost German cell service provider

• Germany filter: What is my best option for a low-priced cell phone plan that will ideally include cheap international calling? No data, contracts possible. I'm about to set off to Germany for a few years of volunteer service, and am wondering what to do about my cell phone situation. I already have a European cell phone (from studying abroad in the UK, as well as travels in Germany), so won't need to purchase another one. I already have a German O2 prepaid sim, but would be fine buying a new one if necessary. Anyways, here are my requirements: 1) Cannot be ridiculously expensive. (This is relative... ideally, it would be under 40 EUR/month, extra points if it's less.) 2) Would be some sort of all-inclusive OR pay-as-you-go type thing -- basically, I don't want bills at the end of the month or to have to keep track of my minutes/texts past seeing how much money I have left on my phone. 3) I'd like to be able to place international calls relatively easily and cheaply, or to have a deal like I had when I was on O2 in the UK, where I got x number of free international minutes based on the amount I had topped up in the previous month. (The latter would be preferable, but I've been poking around German cell phone providers' websites and couldn't find anything.) If this won't work out, I'd be fine using Skype or GoogleVoice or whatever, but it would be nice to have it on my phone. 4) Would remain reasonably inexpensive when traveling outside of Germany, since I'll be traveling outside of Germany (but within the EU) as part of my job. Relevant information: 1) I'll be there for at least two years, so would be down with getting a contract. I'll also have a German bank account. 2) I don't need data -- my phone is pretty basic. 3) I'm 20 and will possibly have Zivi status, so am eligible for a lot of the discount Tarifs. 4) I speak German fluently, so am fine navigating websites and such on my own. I searched and read through past posts, but couldn't find anything super relevant. I've never shopped for a cell phone plan anywhere before, and so doing it in a nonnative language is a little more overwhelming. Thanks for your help!

• Answer:

  Explore http://www.test.de/themen/computer-telefon/test/Handytarife-Zeit-fuer-den-Wechsel-1801826-1798870/ for comparisons of providers and plans. You can usually find old issues http://thepiratebay.org/search/warentest/3/3, but it's worth subscribing.