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Через час я вернусь домой и выключу телефон.

Через час я вернусь домой и выключу телефон.
In an hour I will return home and turn off the phone.

Breakdown of Через час я вернусь домой и выключу телефон.

я
I
и
and
домой
home
через
in
вернуться
to return
выключить
to turn off
телефон
phone
час
hour
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Questions & Answers about Через час я вернусь домой и выключу телефон.

Why does через час mean in an hour, and what case is час in here?

Через + accusative expresses a time interval from now: через час = after an hour / in an hour (i.e., one hour from the present moment).
Here час is accusative singular (it looks the same as nominative for this masculine inanimate noun: час).

How would I say in one hour vs in two/three/five hours with через?

You still use через + accusative, but the noun changes with numbers:

  • через один час
  • через два / три / четыре часа
  • через пять / шесть / семь часов
    So: number + the correct form of час.
What does вернусь mean grammatically, and why is it the future tense?

Вернусь is the 1st person singular future of the perfective verb вернуться (to return).
Perfective verbs in Russian form the simple future (one word) to mean a completed action in the future: I will return (and be back).

Why is вернуться reflexive (ending in -ся/-сь), and what’s the difference between -ся and -сь?

In this verb, -ся is part of the dictionary form: вернуться. It’s not “reflexive” in the English sense here; it’s just how this verb is formed (many motion verbs have such pairs).
-сь is a phonetic variant of -ся used after vowels for easier pronunciation:

  • infinitive: вернуться
  • 1st person: вернусь
  • 2nd person: вернёшься
Why is it домой and not в дом / в доме / дома?

These are different ideas:

  • домой = (to) home (direction, destination)
  • дома = at home (location)
  • в дом = into a house (entering a building; not necessarily “home”)
  • в доме = in the house (location inside a house)
    So вернусь домой is the natural way to say I’ll come back home.
Can I change the word order, like moving через час or домой?

Yes. Russian word order is flexible; it changes emphasis more than basic meaning. For example:

  • Через час я вернусь домой и выключу телефон. (emphasizes the time)
  • Я через час вернусь домой и выключу телефон. (more conversational)
  • Я вернусь домой через час и выключу телефон. (time added later) All are grammatical; your original is neutral.
Why are both verbs (вернусь, выключу) perfective, and what aspect would the imperfective versions give?

Both are perfective because they describe completed, single actions in the future:

  • вернуться: return (complete the return)
  • выключить: switch off (result: it’s off)

Imperfective would change the meaning:

  • буду возвращаться = I will be in the process of returning / will be returning (less common here)
  • буду выключать телефон = I will be switching off the phone (habitually/repeatedly) or “I’ll be turning it off (as a process)”—usually not what you mean.
Why is it выключу телефон without a preposition, and what case is телефон?

Выключить is a direct transitive verb: you switch off something, so Russian uses the direct object in the accusative with no preposition.
Телефон is accusative singular, and because it’s masculine inanimate, it looks the same as nominative: телефон.

Would Russians say выключу телефон or выключу телефонный аппарат / выключу мобильный? What’s most natural?

Выключу телефон is natural and common, especially meaning “turn off my phone.”
Also common:

  • выключу телефон (turn off the device)
  • отключу телефон (often “disconnect/disable,” can sound more technical)
  • выключу мобильный (very colloquial: “I’ll turn off my mobile”)
    Your sentence sounds normal.
Why is there no comma before и here?

No comma is used because и connects two verbs with the same subject я in a simple sentence:
я вернусь and (я) выключу.
A comma would appear if the parts were separate clauses with their own structure in a way that requires separation, but here it’s a straightforward compound predicate.

If I wanted to say I’ll return home and then I’ll turn off my phone, how could I emphasize the sequence?

You can add a sequencing word:

  • Через час я вернусь домой, потом выключу телефон. (then)
  • Через час я вернусь домой и после этого выключу телефон. (after that)
    Without extra words, и usually implies a natural sequence here anyway, but these make it explicit.