Previously, PLDT Home and Smart had their own services which you can share some mobile data via gigabytes or megabytes (MB) to other Smart number. I am still waiting for that move from Globe until I found it recently.
From their USSD *143#, Globe Prepaid users can now share their 10 to 30 MB of mobile data to other Globe Prepaid users valid for 1 day. No info so far if this can be done to TM subscribers but the given service fee was a bit to high for me at Php 5 unlike for their share-a-load or share their Globe Rewards points at only 1 peso per text.
To do this, dial and call *143#, choose 8 for Share MB, choose 5 for Share MBs and enter the necessary details. No official words if this is also available to Globe postpaid users.