There are several possible reasons that you're not receiving SMS. If none of the following suggestions help, please contact customer support through the inquiry form.
1. Check your signal strength
If you cannot pick up a signal, try moving to a different location and see if it improves. Also, you might want to try turning on Airplane mode once and then turning it off.
2. Check your spam settings
If you have set spam measures, you may not be able to receive SMS. Check whether SMS rejection is set.
3. Check your settings
If you've set your phone to reject numbers other than those in your contacts, you will not be able to receive our SMS. Check your settings and adjust accordingly.
*For further information on how to modify your settings, contact your carrier.