انا نسيت موعد الاجتماع، ففتحت الرسالة على التليفون.

Because Arabic verbs already show the subject.

• نسيت by itself already means I forgot
• So انا is optional here

Speakers often add انا for one of these reasons:

• to make the sentence clearer
• to give a little emphasis
• to sound more natural at the start of a sentence

So both are possible:

• انا نسيت موعد الاجتماع
• نسيت موعد الاجتماع

Both mean the same basic thing.

نسيت is:

• past tense
• first person singular
• from the verb نسي or ينسى meaning to forget

In Egyptian Arabic, it is pronounced roughly neseet.

The final -ت is what marks I in the past tense. That is why Arabic does not need a separate word for I here, even though انا can still be added.

Yes, it is understandable and correct, but it sounds a bit more formal or MSA-leaning than the most everyday Egyptian choice.

In daily Egyptian speech, many people would more naturally say:

• ميعاد الاجتماع

So:

• موعد الاجتماع = correct, a little more formal
• ميعاد الاجتماع = very common in everyday Egyptian

Also, in casual office speech, some people might even use English loanwords for meeting.

Because it is really two parts joined together:

• فـ = so / then
• فتحت = I opened

So:

• ف + فتحت = ففتحت

The first ف is the connector, and the second ف belongs to the verb itself.

This is completely normal in Arabic spelling.

It shows sequence or result.

Here it means something like:

• so
• then
• so I...

It connects the two actions very naturally:

• I forgot the meeting time, so I opened the message...

If you used و instead, it would just mean and, which is weaker.
Using فـ makes the second action feel like a direct response to the first one.

Because Arabic commonly uses the simple past to tell a sequence of completed actions.

So:

• نسيت = I forgot
• ففتحت = so I opened

English sometimes uses something like I had forgotten... so I opened..., but Arabic does not need a special past perfect form here. The order of events is already clear from the context and from فـ.

Because the speaker means a specific message, not just any message.

So الرسالة means:

• the message

This sounds natural if both speaker and listener can identify which message is meant, for example:

• the message with the meeting details
• the message that had already been received earlier

Arabic uses definiteness very naturally in cases like this.

By itself, رسالة is broad. It can mean:

• a letter
• a message
• a text
• an email
• a chat message

In this sentence, because of على التليفون, most learners should understand it as some kind of digital message, not a paper letter.

So here it most likely means something like:

• a text message
• a chat message
• an email on the phone

Because على is the natural choice for on the phone in the sense of using the phone or looking at something on it.

So:

• على التليفون = on the phone

This fits the idea of opening and viewing a message on the device.

If you used في التليفون, it could sound more like the message is inside the phone or stored there, rather than emphasizing the action of checking it on the device.

التليفون is perfectly understandable and natural enough, but in everyday Egyptian, if you clearly mean a mobile phone, الموبايل is very common.

So a very colloquial version might be:

• انا نسيت ميعاد الاجتماع، ففتحت الرسالة على الموبايل

That said:

• التليفون = fine
• الموبايل = often more everyday if you mean a cell phone

A rough Egyptian-style pronunciation would be:

ana neseet mawʿed el-egtimaaʿ, fa-fataḥt er-risaala ʿala et-tilifoon

A few useful notes:

• نسيت sounds like neseet
• الاجتماع in Egyptian is often closer to el-egtimaaʿ
• الرسالة becomes er-risaala because the ل of ال assimilates before ر
• التليفون is often pronounced et-tilifoon because the ل of ال assimilates before ت

In fast speech, the two ف sounds in ففتحت may run together a bit, but learners do not need to force that.