Access the messaging options and check the MESSAGE CENTER NUMBER it should be set to +38977000301.
For Android users:
If the above number is already entered, delete it and re-enter the same number. Then, make a call to the code #35000016# and restart your mobile phone.
For iOS users:
Please make a call to the code *#5005*7672#0038977000301# and restart your mobile phone.
If, after performing these checks, you still cannot send or receive SMS messages, please notify us at our email address: kontakt@a1.mk