Typically, responses arrive within 10 minutes for debit cards, but timing may vary. You may experience delays or failures in delivery of an alert because of any of the following circumstances: (1) merchant delay in processing a transaction; (2) delays and/or failures attributable to network operators and telecommunications providers; (3) if your mobile device is off or out of operating range of a carrier with an appropriate signal for SMS and/or data services; (4) a variety of other wireless service and coverage conditions; (5) active or passive filtering of e-mail messages; and (6) insufficient space in the email account that is to receive email messages.