How make Free Call with Unknown Number

Aslam O Alikum Friends is article ma Ap ko ye batay jy ga k ap kisi ko bi free ma call kaisy kr sakty ha or wo bi unkown number sy agar ap apny dost ko call kry gy to us k pas unknown number show hoga.
Is k liye apko nichy make free call py click krna hoga. or country select kr k agy number likh k call py click kr dy.
Is sy kisi bi country ma call kr sakty ha.
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