En mi móvil, el icono del correo está al lado del calendario.

In Spanish, en often covers both in and on.

So En mi móvil is the natural way to say on my phone. Spanish does not usually switch to a special word just because English uses on with devices.

Common examples:

• en el móvil = on the phone
• en la pantalla = on the screen
• en el ordenador = on the computer

So even though the literal translation looks like in my phone, the real meaning is on my phone.

Yes, but móvil is especially common in Spain.

• móvil = mobile phone / cell phone
• teléfono = phone, more general
• celular = very common in much of Latin America, less typical in Spain

For Spain Spanish, mi móvil sounds very natural here.

Because Spanish possessives like mi, tu, su, nuestro usually replace the article.

So you say:

• mi móvil = my phone
• tu calendario = your calendar

Not:

• el mi móvil

This is different from English only in structure, not meaning.

Here, correo most naturally means email or mail app.

In modern everyday Spanish, especially with phones and computers:

• correo
• correo electrónico

can both refer to email.

Because the sentence talks about an icon on a phone, learners should understand el icono del correo as the mail/email icon.

Del correo sounds like the icon for the mail/email app or mail function—something specific and identifiable.

• del = de + el
• so del correo = of the mail / of the email

Spanish often uses the definite article where English would not. English says the mail icon, but Spanish often builds that idea as the icon of the mail.

De correo is not impossible in other contexts, but del correo is the most natural phrasing here.

Because this sentence talks about location, and location is normally expressed with estar.

• está al lado del calendario = it is next to the calendar
• es would be used for identity, description, origin, and similar ideas

A useful rule:

• ser = what something is
• estar = where something is / how it is

Since the icon’s position is being described, está is correct.

Al lado de means next to, beside, or by the side of.

So:

• está al lado del calendario = it is next to the calendar

It does not say whether it is on the left or the right. It only says the two things are beside each other.

It is a fixed expression, so learners should remember it as a chunk:

• al lado de

Here al is the contraction of a + el.

The full structure is:

• a el lado de → al lado de

This happens because lado is a masculine singular noun:

• el lado = the side

So:

• al lado de literally comes from at the side of

This contraction is mandatory:

• a + el → al

Because del is the contraction of de + el.

• de el calendario → del calendario

This contraction is also mandatory.

So:

• del correo = of the mail/email
• del calendario = of the calendar

Spanish uses these contractions very often, and they are something learners need to get used to.

Yes. Spanish word order is flexible, especially with introductory phrases.

These are all possible, depending on emphasis:

• En mi móvil, el icono del correo está al lado del calendario.
• El icono del correo está al lado del calendario en mi móvil.
• El icono del correo, en mi móvil, está al lado del calendario. (less neutral)

The original sentence puts En mi móvil first to set the scene immediately.

Not always. It is there because En mi móvil has been moved to the front as an introductory phrase.

So both can appear:

• En mi móvil, el icono del correo está al lado del calendario.
• En mi móvil el icono del correo está al lado del calendario.

The comma gives a slight pause and makes the sentence a bit clearer, but the meaning does not change.