In general, you cannot change the SMS functionality of your Air SIM.
Air SIM for Japan, plan-D
SMS functionality is fixed to the physical SIM and cannot be changed. Please ensure that you purchase the appropriate Air SIM based on whether or not you require SMS functionality, for example: plan-D (data only) or plan-D (data/sms).
Air SIM for Global, plan01, plan01 - Low Data Volume, and plan02
SMS functionality is not available on these Air SIMs.
Air SIM for Global, plan01s and plan01s - Low Data Volume
SMS functionality is included by default and cannot be disabled.