It is important to point out that if you are sending Bulk SMS, you must comply with the data protection laws by your own countries regulator. You are required to obtain written consent from a consumer prior to adding that consumer to a mobile marketing campaign. This is a very specific term that means an agreement, in writing, bears the signature of the person being marketed to and clearly shows that they are authorising the seller to deliver advertisements or other marketing messages to their phone. The telephone number to which the signatory authorises these marketing messages or advertisements must also be included in the written consent form. You are obligated to give your customers an opt-out option at the end of every SMS you send.