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Poland’s largest mobile phone network operator T-Mobile will let its customers to top-up their mobiles by using bitcoins as legal tender.

The customers who pay with bitcoins will be granted with a 20 percent discount on every top-up for three months. But first, they need to download one of the bitcoin portfolios available on Google Play or App stores.

T-Mobile International AG  is a holding company for Deutsche Telekom AG’s various mobile communications subsidiaries outside Germany.