I'm not sure if Globe also use 51502 for their prepaid SIMs since it's used in postpaid and the APN is different for prepaid users. Unlike Smart which uses the same APN for both prepaid and postpaid users.
For the benefit of Globe prepaid users, I've edited the Globe's APN to reflect the proper APN automatically. You can rename the default Globe folder to Globe_ph.bundle.bak and just copy the attached file (after unzipping) to the Carrier Bundle folder. Don't forget the permissions. No need to edit the symlink. Then reset your networks settings to reflect load the new one.
Settings > General > Reset > Reset Network Settings