Google's Triangle app can help you preserve your data every month8
In addition, Triangle also acts as a "Data Saver" by limiting certain apps from going online for more than 10 minutes or 30 minutes at a time. All of this information can already be obtained by Android users manually. But for those not too knowledgeable about their handset, or who want all of this information in one place, Triangle is a useful app to install.
Two pre-paid carriers in the Philippines, Global and Smart, allow subscribers to track their remaining monthly pre-paid data balance through the app. Subscribers can ever earn free data that can be credited to their account by visiting or downloading certain websites.
What Google's plans are for Triangle are unknown at present, but we should know more after the current testing is complete.
source: Triangle via TechRadar