SMS Scales of the Optical company from Krusevac is the first to implement the option of SIM card balance check which is located in the SMS Scales. The balance can be checked in 2 ways:
1. USSD codes
2. SMS message
It is sufficient for the beekeeper to send an SMS message to the scale with the following contents:
CREDIT SET [check option]
Instead of "check option" the beekeeper needs to enter the code of his mobile operator. The Scale will reply with "OK" if it received the message and the code was properly entered.
After that it is enough that the beekeeper sends a message with the following content"
SMS Scales will send the credit balance about the card in it.