Views: 1,228 Ulta Mastercard Login Activate: Login to Pay Bill for Ulta Mastercard by Cash or Phone The primary cardmember on the account must activate the new Ultamate Rewards® Mastercard online or by phone by calling 1-866-489-3455. To … Continue reading Ulta Mastercard Login Activate: Login to Pay Bill for Ulta Mastercard by Cash or Phone