Maybe it has something to do with Sun Cellular already using Smart signal. I'm a Sun Cellular posptpaid subcriber and for the past weeks ay makulit sila magpadala ng advisory regarding sa mas pinalakas na signal ng Sun. I followed the instructions to get better Sun signal and what happens is that kapag nasa area na mahina signal ng Sun, nagiging Smart ang lumalabas na network ko.
For the past three days na yata ay imbis na Sun ang signal ko ay Smart ang lumalabas.