Need a method to call for free GSM

Need a method to call for free GSM

I´m looking for a method to call for free worlwide with cellphone or mobile phones without Internet, voip or what else..Just GSM, i stay in Germany.. Don´t send me an offer with "Earn credit and call scheme, A mobile phone/pc app which gives credit or what else.."
Please let me your offer..

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Requirements

Have a look my Description

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Skills Required

Mobile Phones Cellphone