Подтверждение личности: позвоните в контактный центр по номеру на обороте карты.

Подтверждение is a noun meaning confirmation or verification.
Личности is the genitive singular of личность.

So literally, Подтверждение личности means verification of identity or identity confirmation.

This is a very common Russian pattern:

• подтверждение личности = confirmation of identity
• проверка документов = checking of documents
• защита данных = protection of data

In other words, the second noun often goes into the genitive to show of ....

No. That is a very common point of confusion.

Although личность can sometimes refer to a personality or individual/person in other contexts, in official or banking language подтверждение личности means identity verification.

So here it is about proving who you are, not about your character or personality.

The colon shows that Подтверждение личности is acting like a heading or label, and what comes after it is the instruction related to that heading.

So the structure is like:

• Identity verification: call the contact center...

This is very common in notices, app messages, bank instructions, and formal interfaces.

Позвоните is the imperative form of the perfective verb позвонить.

That usually gives the sense of:

• make a call
• call
• a single completed action

By contrast, звоните comes from звонить (imperfective) and can sound more like:

• call / be calling
• call regularly
• call in general

In instructions like this, Russian often prefers the perfective imperative because it tells you to perform one concrete action.

So:

• Позвоните... = Please call... / Call...

Yes. Позвоните is the imperative plural form, and in Russian that form is also used for polite singular you.

So it can mean:

• you all, call
• or please call when speaking politely to one person

In notices and official messages, Russian normally uses this polite/plural form rather than the informal singular позвони.

Russian usually does not include the subject pronoun when the verb ending already makes it clear.

Here, позвоните already tells us that the instruction is directed to you (polite singular or plural).

So Russian naturally says:

• Позвоните в контактный центр...

instead of explicitly adding вы.

Adding вы would usually sound unnecessary unless you wanted special emphasis.

After в, the noun here is in the accusative case:

• контактный центр → accusative singular
• for this inanimate masculine noun, the form looks the same as the nominative

So:

• в контактный центр

This is used because Russian commonly says позвонить в plus an organization/place, meaning to call into / call to that institution.

Examples:

• позвонить в банк = call the bank
• позвонить в офис = call the office
• позвонить в контактный центр = call the contact center

Yes, basically. Контактный центр is a formal Russian equivalent of contact center or call center.

In practice, in a banking message like this, it means the customer support phone service.

So a natural English understanding would be:

• contact center
• customer service center
• call center

depending on style.

Because Russian uses the fixed expression:

• звонить по номеру = to call using the number / at the number

Here по requires the dative case, so:

• номер → номеру

This is just the standard way to say it in Russian.

Compare:

• набрать номер = dial a number
• позвонить по номеру = call the number / call at the number

So in this sentence:

• по номеру = using the number / at the number

Номеру is the dative singular of номер.

That is because the preposition по often takes the dative.

So:

• номер → номеру

In this phrase, по номеру is a set expression meaning something like:

• by the number
• using the number
• at the number

English and Russian structure this idea differently, so it is best to learn звонить по номеру as a chunk.

It means on the back of the card.

Breakdown:

• на = on
• обороте = reverse side / back side
• карты = of the card

So literally:

• on the reverse of the card

A very natural English translation is:

• on the back of the card

Обороте is the prepositional singular of оборот.

That is because after на when talking about location (not motion), Russian uses the prepositional case:

• на обороте = on the reverse side / on the back

Compare the general idea:

• на столе = on the table
• на карте = on the map
• на обороте = on the reverse side

So here it is describing where the number is located.

Because карты depends on оборот and answers the question of what?

• оборот карты = the reverse/back of the card

That requires the genitive singular:

• карта → карты

So:

• на обороте карты = on the back of the card

If it were карту, that would be accusative singular and would not fit this structure.

Yes. Both are natural.

• на обороте карты = on the back/reverse of the card
• на обратной стороне карты = on the reverse side of the card

The version with оборот is concise and common in formal written instructions.
The version with обратной стороне may sound a little more explicit.

It has two parts:

1. Подтверждение личности:
   a heading/topic: Identity verification

2. позвоните в контактный центр по номеру на обороте карты.
   the instruction: call the contact center using the number on the back of the card

So the sentence is basically:

• Identity verification: call the contact center at the number on the back of the card.

The given word order is natural and clear, especially for official instructions.

• Позвоните в контактный центр по номеру на обороте карты.

Russian word order is fairly flexible, but changing it can affect emphasis or clarity.

For example, Russian could also say:

• Позвоните по номеру на обороте карты в контактный центр.

This is still understandable, but the original version sounds smoother and more standard in formal notices.

So for a learner, the safest approach is to remember the original phrasing as a standard model.

It is formal and standard, like something you would see in:

• a banking app
• a security message
• a customer support notice
• official written instructions

Clues include:

• Подтверждение личности
• контактный центр
• polite imperative позвоните
• compact official phrasing

It is not slangy or conversational.