Why can't domestic mobile phones send short messages to Romanian mobile phones?

Hello. To send an international short message, enter: international code (00 or+)+country code+customer number at the sending number.

Sending international short messages does not require international roaming and international long-distance services.

Romania seems to be a UMTS network. Telephone: international direct dial telephone is applicable.

According to you, your message should have been sent successfully.

This is how mobile users send international short messages.

The other party's mobile phone didn't receive it. Could it be caused by different network frequency bands?

Let the other party try to send it to you. It may be a network problem.