hi i suggest you try this link, its a simulation of the plan your are trying to get with samsung s5, just make sure not to submit it, if you are planning to get your line in a store
If you already have a plan. It is best to call 211 to get further details or contact customer service via live chat (just click on Help&Support on top and click live chat, then type POSTPAID CHAT and enter your account details needed).
It's going to be easy to know your current plan details, especially for your combos and your remaining peso value so you could get a grab of how much you will be consuming.
Nevertheless, if a globe store is readily available near you, you can also visit one during their office hours.