Pre, are you a heavy user? Like do you download a lot and use a lot of data on a daily basis?
If yes, I suggest stick to your plan. If not, they will upgrade your plan as long as you completed your lock-in period. May bayad ata kapag magpapaupgrade ng plan kapag nasa lock in period pa. Ewan lang. Pero kapag upgrade ata to a higher plan ay walang bayad kahit nasa lock in period.