Smart has just announced that it has expanded its prepaid roaming services to 120 countries worldwide with the same daily flat rate of Php550. The updated list of roaming partners are listed here.

To activate the roaming service, Smart Prepaid subscribers simply have to text ROAM ON and send it to 333 before leaving the country. At their destination, they simply have to turn their mobile data on, then dial *133# to access the menu to choose Data Roaming and their preferred denomination.
Do note that the daily rate is only applicable from 12am to 11:59pm Philippine Time.
For more information about how to use Surf Abroad 550, visit smart.com.ph/prepaidsurfabroad.
Surf Abroad 550 is also available as a fully automated service for Smart Postpaid subscribers, for a worry-free data roaming experience.

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c says:
🥈 Silver🏆2
I am confused.
12am to 11:59pm Philippine Time > that is basically the whole day except for a minute.
550 is very expensive for a day. This would only be for data eg 3g / lte etc? How about your calls and texts?