No paro de mirar el móvil cuando espero una respuesta.

In Spanish, parar de + infinitive literally means to stop doing something, so no parar de + infinitive means not to stop doing something.

So:

• paro = I stop
• no paro de mirar = I don’t stop looking/checking
• natural English: I keep checking / I can’t stop looking at

It’s a very common, natural way to talk about repeated or obsessive actions.

Compare:

• No paro de hablar. = I keep talking.
• No paro de pensar en eso. = I can’t stop thinking about that.

In this sentence, it gives a feeling of constant repetition.

Because after parar de, Spanish uses an infinitive, not a gerund.

So the pattern is:

• parar de + infinitive
• dejar de + infinitive
• acabar de + infinitive

Examples:

• No paro de mirar el móvil.
• Dejé de fumar.
• Acabo de llegar.

Using mirando here would be incorrect.

In Spain, el móvil means mobile phone / cell phone.

This is the usual word in Spain. In many Latin American countries, people more often say:

• el celular
• sometimes el teléfono

So mirar el móvil in Spain often means to look at/check your phone.

Because mirar usually means to look at or to watch deliberately, while ver is more like to see.

Here the person is actively checking the phone, so mirar fits better.

• mirar el móvil = to look at/check the phone
• ver el móvil would sound less natural in this context

A similar contrast in English is:

• look at the phone → active
• see the phone → just perceive it

Because Spanish often leaves out subject pronouns when the verb already shows who the subject is.

Here, paro and espero both clearly show I:

• paro = I stop
• espero = I wait / I’m waiting

So yo is unnecessary unless you want emphasis or contrast:

• Yo no paro de mirar el móvil... = I keep checking my phone...
  This sounds more emphatic, like I do this (maybe unlike other people).

Both are possible, but they are not exactly the same.

Cuando espero una respuesta sounds more general or habitual:

• Whenever I’m waiting for a reply
• When I’m waiting for a reply as a usual situation

Cuando estoy esperando una respuesta sounds more specific and focuses more on the action in progress at that moment:

• When I’m in the middle of waiting for a reply

So the original sentence feels very natural if the speaker means this is a repeated habit.

Because here cuando refers to a habitual/repeated situation, not a future event.

• Cuando espero una respuesta, no paro de mirar el móvil.
  = When/Whenever I’m waiting for a reply, I keep checking my phone.

This is a general truth or repeated behavior, so Spanish uses the present indicative.

If you were talking about a future situation, Spanish would normally use the subjunctive after cuando:

• Cuando espere una respuesta, intentaré no mirar tanto el móvil.
  = When I’m waiting for a reply, I’ll try not to check my phone so much.

So:

• habitual/general → cuando + indicative
• future → cuando + subjunctive

Because una respuesta means a reply / some reply, not a specific already-identified reply.

The speaker is talking about waiting for a response in general, so the indefinite article sounds natural.

• una respuesta = a reply
• la respuesta = the reply / the answer

If you said la respuesta, it would sound like both speaker and listener already know which exact response is being referred to.

It can potentially mean either in some contexts, because esperar can mean both to wait for and to expect.

But in this sentence, the meaning is clearly to wait for a reply/response.

That’s because the rest of the sentence is about constantly checking the phone, which strongly suggests waiting for a message or response.

So here:

• espero una respuesta = I’m waiting for a reply

Yes, respuesta can mean answer or response, depending on context.

• In conversation or messaging, it often means reply or response
• In a question-and-answer context, it can mean answer

In this sentence, because of mirar el móvil, respuesta is best understood as reply / response, probably to a message.

Yes. No dejo de mirar el móvil is also correct and means something very similar: I can’t stop checking my phone.

But there is a slight difference in feel:

• No paro de mirar... is very common and often sounds more vivid, repetitive, and colloquial
• No dejo de mirar... also means I don’t stop checking..., but can sound a bit less colloquial depending on context

Both are natural, but no paro de is especially good for expressing restless repetition.

Most naturally, it sounds like a habitual or typical behavior.

• No paro de mirar el móvil cuando espero una respuesta. = I keep checking my phone when I’m waiting for a reply.

This suggests this is what I usually do in that situation.

If the speaker wanted to focus more clearly on what is happening right now, they might say something like:

• No paro de mirar el móvil porque estoy esperando una respuesta.

That sounds more tied to the current moment.

It sounds very natural and conversational. It suggests mild anxiety, impatience, or obsession in a relatable everyday way.

The phrase no paro de gives the sentence emotional force: the speaker is not just waiting calmly, but repeatedly checking the phone.

So the tone is something like:

• casual
• expressive
• slightly frustrated or self-aware

It sounds like something a real person would say in everyday Spanish in Spain.