Yes, of course, but international calls will be billed. 
 

you can check it out in meino2 or read the price list 

Hi @IsrAA, 

welcome to our English community. 

I just had a look to your tariff. You have the tariff “o2 my Prepaid S”. Please check the details of your tariff here: o2 my Prepaid S As you can see, your tariff includes EU Roaming. But it does not include a connection from Germany into an EU-country. 

@Denner already suggested to look into the pricelist which is a good idea. 

I hope that you now have all the information you need. 

If you have any further questions, just let me know. 

Loving greetings,

Tobias