Los datos móviles funcionan con buena cobertura móvil.

In Spanish, datos móviles is a fixed expression meaning mobile data. Even though English often treats data as a mass noun, Spanish normally uses datos in the plural in this context.

So:

• los datos móviles = mobile data
• el dato = a piece of data, one data point

Using the singular here would sound unnatural.

Móviles is the plural of móvil. The accent stays because it is part of the word’s standard spelling.

• singular: móvil
• plural: móviles

The accent helps show the stress falls on the mó syllable. This is something you simply learn with the word.

Because the subject is plural: los datos móviles.

In Spanish, the verb must agree with the subject:

• Los datos móviles funcionan = Mobile data works
• El dato funciona = The data point works

Since datos is plural, the verb must also be plural: funcionan.

Yes, literally funcionar means to function, but in everyday Spanish it is also very commonly used where English would say to work.

So here funcionan means something like:

• work
• work properly
• function

It sounds very natural in Spanish.

Here con means with and expresses the condition under which something works.

So the idea is:

• funcionan con buena cobertura móvil = they work with good mobile coverage / when there is good mobile coverage

Spanish often uses con in this way to show what something depends on.

Because buena is an adjective, and cobertura is a noun.

• buena = good
• bien = well

You use buena to describe the noun cobertura:

• buena cobertura = good coverage

You would not use bien directly before a noun like that.

Spanish often leaves out the indefinite article when speaking generally.

So:

• con buena cobertura móvil = with good mobile coverage

This sounds natural and general.
You could also say:

• con una buena cobertura móvil

That is also grammatical, but it can sound a little more specific or emphatic. In many general statements, Spanish prefers no article here.

Because each noun phrase needs to be clear on its own:

• datos móviles = mobile data
• cobertura móvil = mobile coverage / cellular coverage

Even though English might avoid repetition more often, Spanish can repeat the adjective if it helps keep the meaning precise. It is understandable and grammatical.

That said, stylistically, some speakers might prefer a smoother sentence to avoid repetition.

It is understandable, but many native speakers in Spain would more naturally say cobertura or cobertura de móvil, depending on context.

For example:

• Los datos móviles funcionan con buena cobertura.
• Los datos móviles funcionan bien si hay buena cobertura.

Since datos móviles already makes the topic clear, repeating móvil in cobertura móvil can sound a bit heavy, though it is not wrong.

This follows normal Spanish word order.

• buena is a common descriptive adjective that usually goes before the noun in many set phrases like buena idea, buen tiempo, buena cobertura
• móvil here is more like a classifying adjective, so it goes after the noun: cobertura móvil

So the structure is:

• buena cobertura móvil
• good + coverage + mobile

This is very normal in Spanish.

Yes. In Spain, móvil commonly means mobile phone, but it can also work as an adjective meaning mobile.

So in this sentence:

• datos móviles = mobile data
• cobertura móvil = mobile coverage / cellular coverage

Same word, different role:

• as a noun: el móvil = the mobile phone
• as an adjective: datos móviles, cobertura móvil

Yes, that is possible.

Adding bien emphasizes that they work well, not just that they work.

Compare:

• Los datos móviles funcionan con buena cobertura móvil. = Mobile data works with good mobile coverage.
• Los datos móviles funcionan bien con buena cobertura móvil. = Mobile data works well with good mobile coverage.

Both are grammatical. The version with bien may sound a little more natural in everyday speech.

Yes. Depending on context, many speakers might say:

• Los datos móviles funcionan si hay buena cobertura.
• Los datos móviles van bien con buena cobertura.
• Con buena cobertura, los datos móviles funcionan bien.

These can sound a bit more idiomatic in conversation.
But the original sentence is still useful for learning vocabulary and structure.