Usijali; nipigie simu au nitumie ujumbe.

It comes from kujali, which means to care, to mind, or to worry.

In usijali:

• u- = you (singular)
• -si- = a negative marker used in negative commands
• jali = the verb

So usijali means don’t worry or don’t mind.

It is addressed to one person.

Swahili often shows the subject inside the verb, so you do not need a separate word for you:

• u- in usijali shows you (singular)

If you were talking to more than one person, you would use different forms, such as msijali.

Here ni- means me.

It is an object marker attached to the verb, so instead of using a separate word for me, Swahili puts it inside the verb:

• nipigie = call me
• nitumie = send me

A common beginner mistake is to think ni- means I, but in this sentence it means me.

Piga simu means call / make a phone call.

But when you want to say call someone, Swahili changes the verb form to show the action is directed to someone:

• piga → pigia

Then, in this kind of command, the form appears as pigie:

• nipigie simu = call me

So the sentence is not just saying make a call; it is saying call me.

Because the speaker wants the message sent to me.

• tuma ujumbe = send a message
• nitumie ujumbe = send me a message

Just like nipigie, this verb includes ni- for me, and the verb changes form to show a recipient.

Yes, it can look confusing because the form is spelled the same way as a form of kutumia (to use).

But in this sentence, the meaning is clearly send to me, not use. The context makes that obvious:

• ujumbe = message
• the whole sentence is about contacting the speaker

So nitumie ujumbe is understood as send me a message.

Not always. Ujumbe is a general word for message.

Depending on context, nitumie ujumbe could mean:

• send me a text
• send me a WhatsApp message
• send me a written message
• send me a message in general

If you want to be more specific, speakers may say ujumbe wa maandishi for a written/text message, or simply SMS.

Not really. Literally, piga often means hit or strike, but kupiga simu is a fixed expression meaning to call / to phone.

So it is best to learn piga simu as one chunk:

• piga simu = call
• nipigie simu = call me

A natural plural version is:

Msijali; nipigieni simu au nitumieni ujumbe.

Here:

• msijali = don’t worry (to more than one person)
• nipigieni simu = call me (plural command)
• nitumieni ujumbe = send me a message (plural command)