We are planning to enable Field Level Encryption for our Marketing Cloud Instance. Looking at the limitations of FLE from https://help.salesforce.com/s/articleView?id=sf.mc_overview_field_level_encryption_limitiations.htm&type=5, Field-Level Encryption doesn’t support encryption of a mobile number used as a subscriber key value. is mentioned as one of the limitations of FLE.

We are planning to store mobile numbers inside marketing cloud to be used in Mobile Studio for SMS sending. I wanted to know whether it is possible to encrypt the mobile numbers using FLE given that it is NOT a subscriber key. Will Marketing cloud be able to decrypt this mobile number during SMS send time?

1 Answer 1


Field-Level Encryption is not able to decrypt mobile numbers at send-time as explained in the FAQ documentation. You will need to store mobile numbers in non-encrypted format to use them.

You can use Mobile Studio with Field-Level Encryption. Mobile Studio does not permit encryption for mobile numbers used as subscriber keys and does not decrypt mobile numbers at send time.

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