Depends sa Promos ni Dito. Here's my prediction:
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If gayahin ni Dito yung promos/pricing ni Globe then both of them will have similar speeds while si Smart will still be faster.
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If gayahin ni Dito yung promos/pricing ni Smart then Globe will remain very slow and si Smart and Dito will have similar speeds.
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If cheaper yung promos/pricing ni Dito compared kay Smart and Globe, then in the end, Dito will be the slowest out of the three.
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Basically the cheaper the promo/pricing the slower the average speed.
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This theory can be backed up by Speedtest Awards throughout the world.
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Also, alam na naman ni Smart na under sila ni PLDT, they don't really need to worry about promos and plans, pwede lang sila magrely sa PLDT for their fiber backhaul since si PLDT yung may pinakalawak na infrastructure sa Pinas so far, unlike kay Dito where maliit palang infrastructure nila, that's why you don't see Smart offering unlimited na promos for P199 or even P499 (may change in the future).
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Globe on the other hand has a decently robust network, infrastructure, but they still need to compete in promos and plans since most of their Revenue is coming from mobile networks, and not home fiber/dsl. That's why nagpartner sila with Gomo to counter Dito which kinda works.
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Smart may or may not offer unlimited promos in the future since if they released one, maging cannibalized yung plans ni PLDT, and again, since Smart is under PLDT, they shouldn't release one. So far, Dito seems to be following Globe's footsteps, let's see nalang yung average speed ni Dito sa Speedtest Awards Q3-Q4 2021. Hopefully they will be / they should be faster than Smart since 27mbps daw minimum nila. But then again, China eh, ewan ko nalang. And seems like cheap promos nila, adding on to that maliit palang infrastructure nila, close to Disastrously slow speeds but uh, yeah, let's wait for Q3 - Q4. Don't get your hopes up na makaabot sila sa 50mbps in year two though, that is FAR from happening hahahah.