Sms Notification and Greek characters

Sorry for my bad English

I have activated sms notifications in my cs-cart eshop version 2.1.2

I created account in site

I make the api and put the id to cs-cart

The problem is that the Greek characters don’t display in my mobile phone

Only with various symbols like |? |? ||? 3? |#

One Example

||? |? |3|3ul>|? #16 to the amount of &#8364? 7.53 has been placed