Dari segi kemudahalihan nombor, penyedia perkhidmatan itu baik.

Dari segi is a very common Malay expression meaning in terms of, with regard to, or from the perspective of.

In this sentence, it introduces the aspect being evaluated:

• Dari segi kemudahalihan nombor = In terms of number portability

It is often used when you want to judge something according to one particular criterion:

• Dari segi harga = in terms of price
• Dari segi kualiti = in terms of quality

So it works a lot like an English topic-setting phrase.

Kemudahalihan is a formal noun meaning portability.

It comes from mudah alih, which means portable or mobile, and the pattern ke-...-an, which often turns an adjective or quality into an abstract noun.

So the rough idea is:

• mudah alih = portable
• kemudahalihan = portability

This is the kind of word you are more likely to see in formal, technical, or official language than in casual speech.

Yes. Nombor means number, and in this context it refers specifically to a phone number.

So:

• kemudahalihan nombor = number portability

In telecom contexts, this refers to the ability to keep your phone number when changing service providers.

Also, if you know Indonesian, you may notice nomor there. In standard Malaysian Malay, nombor is the usual spelling.

Penyedia perkhidmatan means service provider.

Breakdown:

• penyedia = provider
• perkhidmatan = service / services

Malay often builds noun phrases differently from English. In English, we say service provider, with service first. In Malay, the main noun often comes first, followed by the word that specifies it.

So:

• penyedia perkhidmatan = provider of services

This word order is very normal in Malay.

In Malay, demonstratives like ini and itu usually come after the noun phrase, not before it.

So:

• penyedia perkhidmatan itu = that service provider / the service provider

This is different from English, where that comes before the noun.

Also, in real usage, itu does not always sound as strongly like English that. Sometimes it simply helps make the noun phrase definite, closer to the in English, depending on context.

Malay often leaves out the verb to be when connecting a subject to an adjective.

So:

• penyedia perkhidmatan itu baik literally looks like
• that service provider good

But it naturally means:

• that service provider is good

This is completely normal in Malay. You do not need a separate word for is in simple sentences like this.

Yes. Baik here means good.

In this sentence, it means the service provider performs well or is satisfactory in that particular area:

• baik dari segi kemudahalihan nombor = good in terms of number portability

A useful nuance:

• baik can sound a little neutral, general, or formal
• bagus often sounds a bit more enthusiastic or colloquial

So baik fits well in a fairly formal sentence like this one.

Yes. That version is also grammatical and natural.

Compare the emphasis:

• Dari segi kemudahalihan nombor, penyedia perkhidmatan itu baik.
  This puts the criterion first. It highlights number portability as the frame for evaluation.

• Penyedia perkhidmatan itu baik dari segi kemudahalihan nombor.
  This starts with the subject and sounds a bit more straightforward.

Both are fine. The original version simply gives extra emphasis to the aspect being discussed.

The comma marks off the fronted phrase Dari segi kemudahalihan nombor from the main clause.

It helps the reader see that the sentence begins with a topic-setting expression:

• As for number portability, ...
• In terms of number portability, ...

In careful writing, this comma is very natural. In less formal writing, punctuation in Malay can sometimes be looser, but here the comma is perfectly appropriate.

It is natural, but definitely on the formal / technical side.

The formality comes mainly from expressions like:

• kemudahalihan nombor
• penyedia perkhidmatan

This sounds like something you might read in:

• a telecom review
• a policy document
• a customer-service comparison
• a news article

In everyday conversation, a speaker might choose simpler wording, but the sentence itself is correct and idiomatic in a formal context.