diff --git a/dev/api.go b/dev/api.go
index fc68c29..f2e0a45 100644
--- a/dev/api.go
+++ b/dev/api.go
@@ -653,3 +653,10 @@ func (das *DevAccountService) RequestAlias(ctx context.Context, publicKey string
 		Alias: alias,
 	}, nil
 }
+
+func (das *DevAccountService) SendUpsellSMS(ctx context.Context, inviterPhone, inviteePhone string) (*models.SendSMSResponse, error) {
+	logg.DebugCtxf(ctx, "sent an SMS", "inviterPhone", inviterPhone, "inviteePhone", inviteePhone)
+	return &models.SendSMSResponse{
+		Invitee: inviteePhone,
+	}, nil
+}
diff --git a/testutil/mocks/api_mock.go b/testutil/mocks/api_mock.go
index b020677..2293aa6 100644
--- a/testutil/mocks/api_mock.go
+++ b/testutil/mocks/api_mock.go
@@ -61,3 +61,7 @@ func (m MockApi) RequestAlias(ctx context.Context, publicKey string, hint string
 func (m MockApi) TokenTransfer(ctx context.Context, amount, from, to, tokenAddress string) (*models.TokenTransferResponse, error) {
 	return nil, nil
 }
+
+func (m MockApi) SendUpsellSMS(ctx context.Context, inviterPhone, inviteePhone string) (*models.SendSMSResponse, error) {
+	return nil, nil
+}