Tekintettel arra, hogy lejárt a hűségidő, az előfizető másik díjcsomagot választ.

It means something like given that, considering that, or in view of the fact that.

It is grammatically fine, but it sounds more formal and official than a simple everyday because. In normal speech, Hungarian would often use:

• mivel = since, because
• azért, mert = because
• amiatt, hogy = because of the fact that

So this sentence has a slightly administrative / contractual / formal tone, which fits words like előfizető and díjcsomag.

Because this is a fixed Hungarian pattern: [expression] + arra, hogy...

Here arra literally means to that, and it points forward to the clause introduced by hogy.

So the structure is roughly:

• tekintettel arra = with regard to that
• hogy lejárt a hűségidő = that the loyalty period has expired

This kind of forward-pointing demonstrative is very common in Hungarian. Similar patterns are:

• örülök annak, hogy... = I am glad that...
• sajnálom azt, hogy... = I regret that...
• annak ellenére, hogy... = despite the fact that...

So arra is not random; it is part of the grammar of the phrase.

Tekintettel is the word tekintet with the -val/-vel ending, which usually means with.

Because of sound assimilation, tekintet + -vel becomes tekintettel.

So historically it is something like:

• tekintet = regard, consideration
• tekintettel = with regard / considering

In modern Hungarian, learners usually just memorize tekintettel arra, hogy as a fixed expression.

Because lejár means to expire, and lejárt means has expired / expired.

The sentence is saying that the loyalty period is already over, and because of that, the subscriber chooses another plan.

So the timeline is:

1. a hűségidő lejárt = the loyalty period expired
2. az előfizető másik díjcsomagot választ = the subscriber chooses another tariff plan

Hungarian often uses the past tense exactly where English would say expired or has expired.

This present tense can sound natural in Hungarian when stating a general consequence, a rule-like situation, or a neutral factual statement.

So this sentence is not necessarily telling a dramatic one-time story. It can sound like:

• Given that the loyalty period has expired, the subscriber chooses another plan.

That is very natural in formal or explanatory language.

If you wanted a more clearly one-time past event, you could say:

• ... az előfizető másik díjcsomagot választott.
  = ... the subscriber chose another plan.

Hűségidő is a compound noun:

• hűség = loyalty, faithfulness
• idő = time, period

Together, in telecom / subscription language, it means loyalty period, minimum commitment period, or contract lock-in period.

This is the time during which the customer is expected to keep the subscription under the agreed conditions.

You may also see similar terms such as:

• hűségidőszak = loyalty period
• hűségnyilatkozat = loyalty commitment declaration

Előfizető means subscriber.

It comes from the verb:

• előfizet = to subscribe

and the ending:

• -ő = a person who does the action

So:

• előfizető = a person who subscribes = subscriber

This -ó/-ő ending is very common in Hungarian:

• tanul → tanuló = student, learner
• vezet → vezető = leader, driver
• hallgat → hallgató = listener, student

Because it is the direct object of választ.

The verb választ means chooses, and the thing being chosen gets the accusative ending.

So:

• díjcsomag = tariff plan / pricing package
• díjcsomagot = tariff plan (as direct object)

This is a basic Hungarian pattern:

• könyvet olvas = reads a book
• autót vesz = buys a car
• díjcsomagot választ = chooses a tariff plan

Because Hungarian often leaves out the article with an indefinite, non-specific object.

So másik díjcsomagot választ is basically:

• chooses another/different tariff plan

This is perfectly normal Hungarian.

Compare:

• egy másik díjcsomagot választ = chooses another tariff plan
  → slightly more explicit
• a másik díjcsomagot választja = chooses the other tariff plan
  → now it is specific/definite

So in your sentence, the bare noun phrase without an article sounds natural because the object is indefinite.

Here it means another or a different one.

That is because there is no definite article before it. So:

• másik díjcsomagot = another / a different tariff plan

But:

• a másik díjcsomagot = the other tariff plan

That distinction is important. Hungarian often uses article choice to help show whether something is indefinite or definite.

The sentence begins with the reason:

• Tekintettel arra, hogy lejárt a hűségidő, ...

and then gives the main statement:

• az előfizető másik díjcsomagot választ.

This word order is natural because the speaker first sets up the background/cause, then states the result.

You could also express the same idea in a less formal way, for example:

• Mivel lejárt a hűségidő, az előfizető másik díjcsomagot választ.

Hungarian word order is flexible, but the beginning of the sentence often carries important framing information such as cause, contrast, topic, or emphasis.

Yes. The original sentence sounds fairly formal. More everyday versions could be:

• Mivel lejárt a hűségidő, az előfizető másik díjcsomagot választ.
• A hűségidő lejárta után az előfizető másik díjcsomagot választ.
• Mert lejárt a hűségidő, másik díjcsomagot választ.
  
  • possible in speech, though this version is less neutral in style

So the original is not difficult because of meaning, but because of its formal phrasing.

Because the sentence starts with a subordinate clause-like introductory expression:

• Tekintettel arra, hogy lejárt a hűségidő, ...

Then the main clause follows:

• az előfizető másik díjcsomagot választ.

In Hungarian, a comma is normally used before and/or after clauses introduced by hogy, especially when the clause is part of a larger sentence structure like this.

So the comma helps mark the boundary between the reason section and the main statement.