सिम कार्ड सक्रिय कीजिए।

• सिम कार्ड = SIM card
• सक्रिय = active
• कीजिए = polite command form of करना (to do / to make)

So the structure is literally something like:

SIM card active make, please

Natural English: Please activate the SIM card.

Hindi often uses a word meaning active plus करना (to do/make) to express the idea to activate.

Hindi very often builds actions with a noun or adjective plus करना.

Here:

• सक्रिय = active
• सक्रिय करना = to make active / to activate

So सक्रिय कीजिए is the polite imperative form of सक्रिय करना.

This pattern is extremely common in Hindi. For example:

• साफ कीजिए = clean it / make it clean
• शुरू कीजिए = start it / begin
• बंद कीजिए = close it / shut it

Yes, कीजिए is a polite or respectful imperative.

It is used:

• when speaking respectfully to one person
• in customer service language
• in written instructions
• in formal situations

So सिम कार्ड सक्रिय कीजिए sounds like a polite instruction: Please activate the SIM card.

Less formal versions might be:

• सिम कार्ड सक्रिय करो = activate the SIM card (informal)
• सिम card सक्रिय करिए = also polite, very similar
• सिम कार्ड सक्रिय करें = formal/polite, often seen in writing

Hindi usually puts the verb at the end.

So instead of:

• Activate the SIM card

Hindi naturally says:

• SIM card active make

That is why सिम कार्ड comes first and कीजिए comes at the end.

A rough breakdown is:

• object: सिम कार्ड
• result/state: सक्रिय
• verb: कीजिए

This object + complement + verb order is very normal in Hindi.

Because सिम कार्ड is the direct object here, and direct objects in Hindi do not always take को.

In many cases, को is used:

• for people
• for specific/definite animate objects
• in certain other grammatical situations

But with an inanimate object like सिम कार्ड, leaving out को is completely normal.

So:

• सिम कार्ड सक्रिय कीजिए = natural

Using को here would sound unusual in most normal contexts.

सक्रिय is pronounced approximately sak-riy.

A helpful breakdown:

• स = s
• क्रि = roughly kri
• य at the end gives a ya/iy kind of sound

So it is close to:

• suk-riy or
• sak-riy

Depending on accent and speed, the middle can sound a little compressed.

This is a somewhat formal Sanskrit-derived word, so learners often find it less intuitive than everyday Hindi words.

कीजिए is pronounced approximately kee-jee-eh or kee-jee-yeh.

Breakdown:

• की = kee
• जि = ji
• ए at the end gives an eh/yeh sound in connected speech

So a practical pronunciation guide is:

kee-jee-yeh

You may also see the spelling कीजिये. That is just a spelling variant; the meaning is the same.

The base verb is करना = to do / to make.

This verb changes form in commands:

• करो = do (informal)
• कीजिए / करिए = please do (polite)
• करें = do, please / should do / let ... do, depending on context

In this sentence, कीजिए comes from करना, but it combines with सक्रिय to mean activate.

So the dictionary form of the whole expression is:

सक्रिय करना = to activate

It is understandable and correct, but it sounds somewhat formal or official.

In everyday speech, many Hindi speakers might also say:

• सिम कार्ड एक्टिवेट कीजिए
• सिम कार्ड चालू कीजिए (depending on context)

Because modern Hindi often mixes English technical words with Hindi grammar, एक्टिवेट कीजिए is very common in real life.

So:

• सक्रिय कीजिए = correct, formal, standard
• एक्टिवेट कीजिए = very common in everyday modern usage

Because it is a borrowed term from English.

Hindi regularly borrows modern technical words and writes them in Devanagari:

• सिम = SIM
• कार्ड = card

This is very common with technology vocabulary, such as:

• फोन
• नेटवर्क
• मैसेज
• चार्जर

So the sentence mixes:

• an English loan expression: सिम कार्ड
• a formal Hindi/Sanskrit-derived word: सक्रिय
• a common Hindi verb: कीजिए

That kind of mix is completely normal in modern Hindi.

Yes. सिम कार्ड सक्रिय करें is also correct and common, especially in:

• written instructions
• official notices
• forms
• menus
• customer support language

The difference is mostly one of style:

• कीजिए = polite spoken command, also used in writing
• करें = slightly more formal or instruction-like

Both can mean:

• Please activate the SIM card

Grammatically, कीजिए is a respectful form and can be used:

• for one person respectfully
• sometimes for people in general in instruction language

So in practice, it usually feels like:

• please do this addressed politely to one person or
• a general polite instruction

Hindi polite forms often do not sharply distinguish between singular respectful and general polite instruction in the way English does.

Yes, that is a very helpful literal understanding.

• सक्रिय = active
• करना = to make/do

So सक्रिय करना is literally to make active.

That literal meaning matches the natural English verb to activate very closely. This is a good example of how Hindi often expresses ideas analytically rather than with a single verb.