zhège yùnyíngshāng de yuèzūfèi bǐjiào piányi.

In Mandarin, a demonstrative like 这 usually needs a measure word before a noun. So the normal pattern is:

这 + measure word + noun

That gives you 这个运营商.

Here, 个 is the general-purpose measure word. However, for a company or business, many speakers would find 这家运营商 even more natural, because 家 is commonly used for businesses and establishments.

So:

这个运营商 = this operator/service provider
这家运营商 = this operator/service provider, often more natural

运营商 means operator, service provider, or carrier, depending on context.

In everyday modern Chinese, it often refers to a telecommunications company, such as a mobile carrier or internet provider. So in this sentence, it most likely means something like:

this carrier
or
this service provider

It is more specific than 公司, which just means company.

的 links 运营商 and 月租费. It shows that the monthly fee belongs to, or is associated with, that carrier.

So:

这个运营商的月租费
literally = this carrier’s monthly fee

You can think of 的 here as similar to the English ’s or of, although it is used much more broadly in Chinese.

In this sentence, it is better to keep 的.

这个运营商的月租费 sounds natural and clear.
Without 的, the sentence sounds awkward to most learners and in many contexts would feel ungrammatical or at least much less natural.

Chinese sometimes allows noun modifiers without 的, but that usually happens in tighter, more fixed combinations. Here, 运营商的月租费 is the normal way to say it.

Literally, 月租费 breaks down as:

• 月 = month
• 租 = rent / lease
• 费 = fee / charge

But in actual use, 月租费 usually means a monthly fee, monthly service charge, or monthly subscription fee.

In phone or internet contexts, it does not mean apartment rent. It refers to the regular monthly amount you pay to keep the service.

Yes, 月费 is also common and is often shorter and more conversational.

For example:

这个运营商的月费比较便宜。

That means almost the same thing: This carrier’s monthly fee is relatively cheap.

月租费 can sound a little more specific or formal, especially when talking about service plans and contract charges.

This is a very common question. In Chinese, 比较 does not always need an explicit than... phrase.

Here, 比较 means something like:

relatively
fairly
comparatively

So 比较便宜 means relatively inexpensive or fairly cheap. The comparison is understood from context, such as compared with other carriers, other plans, or the usual market price.

So the sentence is not necessarily saying cheaper than X. It is saying the monthly fee is on the cheaper side.

They are related, but they are not used the same way.

比 is the direct comparison marker, like than in English:

这个运营商的月租费比那个运营商的便宜。
= This carrier’s monthly fee is cheaper than that carrier’s.

比较 in your sentence is a degree adverb meaning relatively or rather:

这个运营商的月租费比较便宜。
= This carrier’s monthly fee is relatively cheap.

So:

• 比 = explicit comparison
• 比较 = relative degree, often without naming the thing being compared

Because 便宜 is an adjective, and in Mandarin, adjectives can act like predicates by themselves.

So Chinese often says:

月租费比较便宜
literally something like the monthly fee relatively cheap

You do not need 是 here.

Using 是 before an adjective is usually incorrect in this kind of sentence. So:

月租费是便宜 ❌
月租费比较便宜 ✅

A degree word is often used before predicate adjectives in Mandarin, and 很 is one very common option. But it is not the only one.

In this sentence, 比较 already serves that function. It modifies 便宜, so 很 is unnecessary.

Compare:

月租费很便宜。 = The monthly fee is very cheap / quite cheap.
月租费比较便宜。 = The monthly fee is relatively cheap.

So the adjective is not standing alone; it is already being modified by 比较.

Yes, this is completely normal in Chinese.

便宜 can describe prices, costs, fees, products, services, and many other things related to expense. Chinese uses it much more broadly than English uses cheap in some contexts.

So all of these are natural:

这个手机很便宜。
机票比较便宜。
月租费比较便宜。

In English, you might translate it more naturally as:

inexpensive
low
affordable

rather than always using cheap.

Usually it suggests a relative judgment.

So 比较便宜 often means:

• cheaper than many alternatives
• on the inexpensive side
• fairly affordable in context

It is softer than simply saying 很便宜 or 非常便宜.

If you want to make the comparison explicit, you can say:

这个运营商的月租费比别家的便宜。
= This carrier’s monthly fee is cheaper than other companies’.

Both are understandable, but 家 is often more natural for a business or company.

So many native speakers would prefer:

这家运营商的月租费比较便宜。

That said, 这个运营商 is still understandable and not unusual in learner materials, especially because 个 is the default classifier and easy to use.

A good rule of thumb:

• 个 = safe general classifier
• 家 = often better for companies, shops, restaurants, and similar establishments

The structure is:

这个运营商的月租费 + 比较便宜

So:

• 这个运营商的月租费 = topic/subject-like noun phrase
• 比较便宜 = predicate

A useful way to see it is:

[This carrier’s monthly fee] [is relatively inexpensive].

This is a very common Chinese pattern:

noun phrase + degree word + adjective

For example:

这件衣服很贵。
这个地方比较安静。
他的手机不便宜。

So your sentence follows a very standard Mandarin pattern.