Mobilnummeret er stadig det samme.

In Danish, compound nouns are normally written as one word, so mobilnummer means mobile number.

The ending -et is the definite article attached to the noun. Danish often puts the at the end of the noun instead of using a separate word.

• et mobilnummer = a mobile number
• mobilnummeret = the mobile number

So mobilnummeret literally means the mobile number.

Because Danish usually marks definiteness by adding it to the end of the noun.

Compare:

• et nummer = a number
• nummeret = the number

This is very common in Danish:

• bilen = the car
• huset = the house
• telefonen = the phone

So in this sentence, mobilnummeret already includes the, and you do not add another article before it.

Det samme is a very common Danish expression meaning the same.

Here, samme means same, and det works like the thing/that in a general way. Together they form the standard phrase:

• det samme = the same

So:

• Mobilnummeret er det samme = The mobile number is the same

In English, same also usually needs the: the same, not just same. Danish works similarly here.

Here det is a neuter pronoun/article-like word that helps form the expression det samme.

You can think of it as standing for that thing or it, but in practice it is best learned as part of the fixed phrase:

• det samme = the same

You will also see similar patterns in Danish:

• det vigtigste = the most important thing
• det bedste = the best thing / the best

So in this sentence, det samme functions as the complement after er.

In a normal Danish main clause, the finite verb usually comes in second position. That is why er comes before stadig.

The structure is:

• Mobilnummeret = subject
• er = finite verb
• stadig = adverb
• det samme = complement

So the word order is natural Danish:

• Mobilnummeret er stadig det samme.

This is similar to English is still the same, where still also often comes after the verb be.

Yes, here stadig means still in the sense of continuing to be true.

So the sentence says that the mobile number has not changed.

Examples:

• Han bor stadig i Aarhus. = He still lives in Aarhus.
• Det regner stadig. = It is still raining.

So stadig is used when something continues.

This is a very common learner question because both can sometimes translate as still.

A simple rule:

• stadig = still / continuing
• endnu = often yet, sometimes still depending on context

In this sentence, stadig is the most natural choice because it emphasizes that the situation continues unchanged:

• Mobilnummeret er stadig det samme.

Using endnu here is possible in some contexts, but stadig is clearer and more standard for it remains the same.

Very roughly:

• Jeg venter stadig. = I am still waiting.
• Jeg venter endnu. = can sound more like I am waiting yet/still, but is less neutral in many everyday contexts

For learners, it is safest to use stadig for this kind of sentence.

No, that would not sound correct in standard Danish.

You normally need det samme when you mean the same in this kind of sentence:

• Mobilnummeret er det samme. = correct
• Mobilnummeret er samme. = incorrect

If you restructure the sentence, you can use samme before a noun:

• Det er samme nummer. = It is the same number.

So:

• before a noun: samme nummer
• on its own in this sentence: det samme

No, samme is generally invariable, which means it does not change form the way many other adjectives do.

For example:

• samme bil = the same car
• samme hus = the same house
• samme numre = the same numbers

That makes samme easier than many other Danish adjectives.

What changes around it is often the article or the noun, not samme itself.

Both exist, but they are used a little differently.

• mobilnummer = mobile number / cell number
• telefonnummer = telephone number / phone number

If you specifically mean a cell phone number, mobilnummer is very natural. If the distinction does not matter, people may also say telefonnummer in everyday speech.

So this sentence sounds natural if the speaker is specifically talking about a mobile phone number.

A careful pronunciation would be something like:

mo-BEEL-num-reth air STA-thi deh SA-muh

A few helpful notes:

• mobil has stress on the second syllable: mo-BIL
• nummeret is often pronounced quite smoothly, almost like num-rət
• er is often pronounced very lightly in normal speech
• stadig is commonly pronounced something like stæ-thi in everyday Danish
• det samme is often said quickly, with det sounding short and light

Natural spoken Danish tends to reduce sounds quite a lot, so it may sound more compressed than the spelling suggests.

Yes, but the original order is the most neutral.

Standard statement:

• Mobilnummeret er stadig det samme.

If you move something to the front, the verb must still stay in second position:

• Stadig er mobilnummeret det samme.

That version is grammatical, but it sounds more literary or marked. In everyday Danish, the original sentence is much more natural.

So for normal conversation, stick with:

• Mobilnummeret er stadig det samme.