Depending on what carrier your user is with the gateway may manage cookies on behalf of the device. Cookies can be used for remembering users (long lived) and for sessions (short-lived). Some gateways may have a tendency to forget cookies before they are set to expire just to save space in the database, but for sessions it's still OK. Some carriers only remember 20 cookies for each user so there is a chance that it will not work for a user that has not been to your site in a week or twoLee J Andron said.
Don't forget ever expanded Global Authoring Practices for Mobile Web Development.
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