Apps to call cabs/taxis in Germany for non-German speakers

I will be travelling to Germany next week. I don't speak German, only Portuguese and English.
Are there mobile apps for me to call taxis in Germany (Frankfurt) in English, such as 99 and easy taxi?
I will also be in Seligenstadt for some days probably, and my hotel is in Obertshausen.
How about uber?
I am with an iPhone 4
Best Answer
The taxi.eu app works in Germany and is localized.
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Which taxi app works in Germany?
The 8 best taxi apps in Europe (and several Uber alternatives)Is there anything like Uber in Germany?
Uber & Taxi apps in GermanyUber currently only operates in six cities: Berlin, Cologne, D\xfcsseldorf, Frankfurt, Hamburg and Munich, and has had to contend with stiff competition from well-established German companies such as Mytaxi, Taxi.de and door2door.Is Uber taxi available in Germany?
Although Uber currently offers its services in Germany, it does so in only four cities: Frankfurt am Main, Duesseldorf, Munich and Berlin. And, depending on the city and the time of day, you might have to wait for your Uber driver for as long as it takes to get your luggage at the airport \u2013 45 minutes or longer.Is Uber cheap in Germany?
But I noticed that Uber is back in Frankfurt and about 25% cheaper than the cab (60EUR for the cab via MyTaxi app, 45EUR for the Uber). So we tried that.German Taxi cabs!
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Answer 2
mytaxi works pretty well in all larger cities I've tested so far. There definitely is an English version and I like the app's design, e.g. the fact that you can see the current position of the driver and know when to step out of the door.
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