May libreng text ang prepaid na mobile plan.

May means there is/there are or has/have, depending on how the sentence is structured.

In May libreng text ang prepaid na mobile plan, the pattern is:

May + thing possessed + ang + possessor

So the whole sentence can be understood as:

The prepaid mobile plan has free texts
or
There are free texts included in the prepaid mobile plan

This is a very common Filipino pattern for expressing possession.

Filipino often puts the predicate first. That means the part telling you what exists or what is being said can come before the topic.

So instead of an English-like order such as:

The prepaid mobile plan has free texts

Filipino naturally says:

May libreng text ang prepaid na mobile plan

Literally, it is closer to:

There are free texts, the prepaid mobile plan

That sounds odd in English, but it is normal in Filipino.

Ang marks the topic of the sentence.

In this sentence, ang prepaid na mobile plan is the topic. It is the thing being talked about.

So:

• May libreng text = there is free text / it has free text
• ang prepaid na mobile plan = as for the prepaid mobile plan

A helpful way to think of it is:

As for the prepaid mobile plan, it has free texts.

Ang does not always translate directly into English, but it is very important for showing the role of a noun phrase in the sentence.

Libreng is libre plus the linker -ng.

The linker connects a describing word to the noun it modifies.

So:

• libre = free
• libreng text = free text(s)

This is very common in Filipino. When a word ends in a vowel, n, or ng, it often takes -ng before the word it describes.

Examples:

• magandang araw = beautiful day
• murang bilihin = cheap goods
• libreng text = free text

Here, na is also a linker.

It connects prepaid to mobile plan, so prepaid na mobile plan means prepaid mobile plan.

Filipino uses two common linker forms:

• -ng
• na

Which one appears depends partly on the sound or ending of the word before it.

Here:

• prepaid ends in a consonant sound
• so na is used

That is why you get:

prepaid na mobile plan

Usually it means text messages in general, or a texting allowance/service, not just one single message.

Filipino nouns are often not marked for singular vs. plural unless the speaker wants to make it explicit.

So text can be understood from context as:

• text message
• text messages
• texting allowance

If you really wanted to mark plurality, you could use mga, but in this kind of sentence it is often unnecessary.

Because this is very normal in Filipino.

Modern spoken and written Filipino often includes:

• English loanwords
• code-switching
• technical or commercial vocabulary from English

Words related to phones, technology, and services are especially likely to appear in English. So a sentence like this is completely natural.

A more heavily Filipino version might be possible in some contexts, but everyday usage often sounds like this.

Yes, in many contexts you can.

May and meron/merong are often similar in meaning when talking about existence or possession.

So these are both natural:

• May libreng text ang prepaid na mobile plan.
• Merong libreng text ang prepaid na mobile plan.

In everyday speech, people use both.
However, may is especially common in this simple possession pattern.

Yes. That is also correct.

This version puts the topic first:

Ang prepaid na mobile plan ay may libreng text.

Compared with:

May libreng text ang prepaid na mobile plan.

Both mean basically the same thing. The difference is mostly in structure and emphasis:

• May libreng text ang prepaid na mobile plan. = more naturally predicate-first
• Ang prepaid na mobile plan ay may libreng text. = topic first, a bit more explicitly structured

Both are good Filipino.

Usually, yes.

In Philippine usage, text very often means SMS/text message. So libreng text usually means:

• free text messages
• a free texting allocation
• texting included at no extra cost

The exact meaning depends on context. In a mobile-plan ad, it would normally mean some kind of free SMS benefit.