As one of the "tri-net", one of Smart Communications' popular offers is Gigasurf 50 but Sun Cellular has also their own version
They also have their Gigasurf 50 which has the same package as to Smart with 1 GB mobile data for any websites or apps plus 300 MB for Youtube plus unli all net texts valid for 3 days for only Php 50
To register, text GIGA50 and send to 247. The promo is now ongoing until May 31, 2018
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