LabsMobile only charges for messages sent. There is no other cost for registration, maintenance, support, etc.
It is necessary to make purchases or top up credits that will be added to the account balance. As the messages are sent, the credits corresponding to the cost or unit price of each message sent will be deducted. As well as indicating What are the credits?
The unit price of each SMS message is calculated according to the destination country, length and type of message, as explained in What is the price of an SMS message?
You have the unit price per message at LabsMobile Price.
It is possible to contact our support at How and when to get help or support?