You can only have up to 3 different MiiTel Phones logged in under the same account. When you attempt to sign in to MiiTel Phone from the 4th device, the above message will be displayed on the third and following phones regardless of the type of the MiiTel Phone. If you see the above message, please reduce the number of logged in MiiTel Phones to 3 phones.
The number of activated MiiTel Phone Mobile phones will also be counted in the limit.