Hello @ALMDA ,
Per our SMS compliance, you do need to provide a permission granted date for SMS contacts. Generally speaking, you should have to provide at least an opt-in date for any SMS service being utilized. If you already have that for your SMS contacts in your current SMS service, then there shouldn't be any issues importing them over to our service. If you don't have those dates maintained, then you'd either need to have them opt-in again, or you wouldn't be able to use our SMS.
For more info regarding our SMS permissions requirements, make sure to check out our SMS permissions policy article. For an overall nexus of relevant articles on getting started with our SMS tool, I'd suggest this Community post.
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