Since you're using an Android phone you'll need to have FileMaker Server and use WebDirect (or a PHP-based website that connects to FMS). There is no version of FileMaker Go for Android. If possible, it might be easier to do this with an iPhone or an iPad rather than go through Web Direct and Android.
There have been a few people post options for sending SMS messages from FileMaker systems so that shouldn't be too difficult. Searching here on the Community, or a general Google search, should find a few for you. There are many SMS systems out there that will take a string and send it out as an SMS for you. They should all have a published API that you can use.
Likely the most difficult part will be building your workflow for finding students and creating the structure for pushing out the SMS.
FileMaker should be able to handle this for you.
That should be possible, I have done this to send an SMS when a specific process has completed. Look at SMS Gateways in PH, they will usually have API's that you can use with the 'Insert From URL' script step, to build a string based on the API requirements, when a student is logged as having arrived.
I have a quick search on google and this looks like it will do the trick, http://www.bulksms.com.ph.your mobile provider may also have an API that you can use.
Hope this helps you get started.
FYI we sell a solution called fmSMS that could save you and your school a lot of time in development:
We have lots of schools using fmSMS for parent notifications in the same manner you describe. Message me if you need more details etc.
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Thank you. I'll see your suggestions