My 8110 had a memory hiccup; the memory was being taxed and I lost SMS's that I would like to restore. I did not make a backup; is there any restore options going through Research In Motion? Do they have anything of mine stored on their database? How can I find out?
Texts are handled by carrier networks. You can try calling AT&T, but I am not sure if there is a way you can request specific texts. From what I understand, the carriers just saves information from a date to a date (usually in relation to a warrant, or another, similar request). At any rate, contact your carrier and see what they can do for you.
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Once text messages are gone, they are gone. Carriers do keep a backup for some period of time, as said above, but it usually takes a court order to get them. You can try if you have a really good reason why you need them.