Η φορητότητα αριθμού χρειάζεται έγκυρο αριθμό.

Η is the feminine singular definite article, meaning the.

It is used because φορητότητα is a feminine singular noun. So:

• η φορητότητα = the portability

Greek articles change depending on gender, number, and case, unlike English the, which stays the same.

φορητότητα is a noun meaning portability.

It comes from φορητός, meaning portable. In this sentence, it refers to number portability, the ability to keep your phone number when changing provider.

So:

• φορητότητα = portability

Because αριθμού is in the genitive case.

Greek often uses the genitive where English uses of. So:

• φορητότητα αριθμού = portability of number
• more naturally in English: number portability

The basic dictionary form is:

• ο αριθμός = the number

But here it becomes:

• του αριθμού = of the number
• αριθμού = number / of number, depending on context

So αριθμού shows a relationship with φορητότητα.

Yes, it is a very common telecom/administrative expression meaning number portability.

Literally, it is:

• φορητότητα = portability
• αριθμού = of number

Greek often builds this kind of phrase with noun + genitive noun.

χρειάζεται means needs or is needed, depending on context.

In this sentence, it means:

• needs

So:

• Η φορητότητα αριθμού χρειάζεται... = Number portability needs / requires...

It is the 3rd person singular present tense form, matching the singular subject η φορητότητα.

Because it is the direct object of χρειάζεται, so it goes into the accusative case.

The dictionary forms are:

• έγκυρος = valid
• αριθμός = number

But after the verb, as the thing needed, they become:

• έγκυρο αριθμό = a valid number

The adjective and noun must agree with each other, so both are:

• masculine
• singular
• accusative

Because έγκυρος is the nominative masculine singular form, but here the adjective must match αριθμό, which is accusative masculine singular.

So:

• έγκυρος αριθμός = a valid number
• έγκυρο αριθμό = a valid number (as object)

This is a very common pattern in Greek: adjectives change form to match the noun’s case, gender, and number.

Greek has no indefinite article equivalent to English a / an.

So:

• έγκυρο αριθμό can mean a valid number

Greek often leaves indefiniteness unmarked. If there is no definite article, the meaning is often understood as a/an from context.

The sentence follows a straightforward pattern:

• Η φορητότητα αριθμού = subject
• χρειάζεται = verb
• έγκυρο αριθμό = object

So it is basically:

• Subject + Verb + Object

That said, Greek word order is more flexible than English, because case endings help show each word’s role.

Yes, Greek allows more flexibility.

For example, you might also see variations for emphasis, though the original is the most neutral:

• Η φορητότητα αριθμού χρειάζεται έγκυρο αριθμό.

Because the cases make the grammar clear, Greek does not depend on word order as much as English does.

A rough pronunciation is:

• ee for-ee-TOH-tee-ta ah-rith-MOO khree-AH-ze-teh ENG-kee-ro ah-rith-MO

A few helpful notes:

• Η sounds like ee
• θ sounds like th in think
• χ sounds like a rough h/kh sound, not like English ch
• Stress matters in Greek:
  • φορητότητα
  • αριθμού
  • χρειάζεται
  • έγκυρο
  • αριθμό

Yes. Depending on context, χρειάζεται can sometimes be translated more naturally as:

• needs
• requires
• is required

So this sentence could be understood as something like:

• Number portability requires a valid number
• A valid number is required for number portability

The Greek form stays the same, but English may translate it differently depending on style and context.