I don't have a B593 router but an openline ZTE MF90 LTE mifi which amazingly approaches the performance of that modem plus the 5-6 hr battery life and portability. While taking a KFC meal at Trinoma, I chanced upon very good LTE signal inside the mall using my SuperPlan 598 sim only (w/ combo unlisurf) downloading torrents and direct download (via IDM) and speedtest
You're right. It's SuperPlan 499 + 99 (for combo unlisurf) amounting to Php 598 for the past 14 mos. I've been paying. Unfortunately, there's no more unlisurf (unlimited data) option but capped 1.5 - 5 GB gosurf option, which if you exceed the cap you pay Php2 / MB in excess of the cap leading to an addon cost up to Php1500 + your superplan amount. It sucks since I wanted to get the same superplan I had 14 mos. ago in addition to my existing plan.