الشبكة والشريحة شغالين في الجهاز.

In this kind of Egyptian phone/tech context:

• الشبكة usually means the network, signal, or mobile coverage
• الشريحة means the SIM card

So this sentence is talking about two phone-related things being available or functioning.

Because in Arabic, especially in the present tense, the verb to be is usually not said.

So instead of saying something like the network and the SIM are working, Egyptian Arabic simply says:

• الشبكة والشريحة شغالين

Literally, it looks more like the network and the SIM working, but the meaning is naturally are working.

شغالين comes from شغال, which in Egyptian Arabic often means:

• working
• functioning
• on
• active

With phones, devices, apps, electricity, internet, and similar things, شغال is extremely common.

So here شغالين means that both things are functioning properly.

Because the sentence is talking about two things together: the network and the SIM card.

When two items are joined by و meaning and, Egyptian Arabic commonly uses a plural predicate. So شغالين matches the idea of they are working.

Also, in spoken Egyptian Arabic, the plural form in -ين is very commonly used for plural agreement, including with non-human things in everyday speech.

That is a very reasonable question. Individually:

• الشبكة شغالة = the network is working
• الشريحة شغالة = the SIM card is working

But when you put them together as one combined subject, Egyptian Arabic usually switches to a plural idea:

• الشبكة والشريحة شغالين

So the important thing is not the gender of each word separately, but the fact that there are two items together.

في الجهاز literally means in the device.

In English, we might say:

• on the phone
• in the phone
• on the device
• in the device

Egyptian Arabic often uses في for things that are present, installed, functioning, or available within a device or system. So في الجهاز sounds natural for saying that the network and SIM are working in that phone/device.

Because the speaker is talking about specific known things:

• the network
• the SIM card
• the device

In real conversation, this often happens when both people already know which phone or device is being discussed. So the definiteness sounds natural.

If you removed ال, the sentence would sound more general or less tied to a specific situation.

Because ش is a sun letter.

When ال comes before a sun letter, the ل sound blends into the next consonant. So:

• الشبكة is pronounced roughly esh-shabaka or esh-shabka
• الشريحة is pronounced roughly esh-sheriha

But ج in الجهاز is not a sun letter, so the ل stays audible:

• الجهاز = el-gihaaz

So the spelling stays the same, but the pronunciation changes.

A helpful approximate pronunciation is:

esh-shabka wesh-sheriha shagghaleen fil-gihaaz

A few notes:

• الشبكة is often said as esh-shabka in fast Egyptian speech
• والشريحة becomes wesh-sheriha
• شغالين has a strong gh sound: shag-gha-leen
• في الجهاز is often pronounced together as fil-gihaaz

This is specifically Egyptian Arabic or at least clearly colloquial Arabic.

The biggest clue is شغالين, which is very common in spoken Egyptian for working / functioning. In more formal Standard Arabic, speakers would usually choose a different structure, often with a verb like تعمل or يعمل depending on the context.

So if you learn this sentence as everyday speech, it will sound natural in Egyptian conversation.