Jinsi ya kuongeza line number two kwenye internet google account ya android

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Ninatumia android kwenye smartphone double line ambapo natumia line namba 1( tigo) kuaccess internet plus downloading apps from playstore sasa nawezaje kuongeza line namba 2 ( voda) ili niweze kupata internet sambamba na line namba 1 maana tigo muda mwingi network yao inakuwa down.
naomba kuwasilisha