I didn’t sent message to another mobile device

Hi naga18,

We see you are not able to send a message as expected. Are you using iMessage which are blue, or SMS which is green? This will assist in guiding you to sending messages.

If you can't send or receive messages on your iPhone, iPad, or iPod touch

Have a great week!

Hi, you can check this: If you can't send or receive messages on your iPhone, iPad, or iPod touch

If you cannot send a message in the green bubble then you need to call your mobile carrier to check your account & number. Carrier messaging is controlled by the carrier. Apple has no control over the routing of SMS or MMS.