Manila, March 31 -- Grab Philippines is investigating allegations of higher fares being charged to its GrabUnlimited subscribers.

In a statement on Tuesday, the ridesharing and delivery company said prices on its platform are generated in real-time based on the balance of supply and demand, distance, estimated travel time, route conditions, and driver or delivery partner availability.

"Because these factors shift continuously-sometimes within seconds-two transactions for what appears to be the same route or order, initiated even moments apart, may reflect different prices. This is also why prices may vary between devices, sessions, or times of day," it said.

Grab's pricing system, it said, applies the same methodology to every user and...