Hi,
i have the same error message. iphone 4S China Telecom (2040438) but it keep having below error. using x-sim v4.18
Unsupported SIM
Please Insert a SIM with only alphanumeric characters or contact your wireless carrier for more information.
i last try use x-sim v3.09 to activate it and it success activated, then use v4.18 to unlock without any problem. (using Malaysia SIM card)