Hi mjhay_16. Plan 299 has 500 PV (Peso Value) which you can use for combos. Any excess PV after you choose your combos, will become consumable for calls, text, and data. You can add boosters but they will be charged on top of your plan. Your monthly subscription fee is P299 and you will only pay that amount every month unless you exceeded the allowances of your combos or you have availed of a booster or you availed of any services that are actually chargeable over and above your plan.
You can simulate your plan here >>> http://www.globe.com.ph/mysuperplan/-/MySuperPlan/plan?p_auth=OmYw3DHI