This has happened to me twice now and it's happened to my friend twice also. We've both unchecked the delete button under the settings and have set our limit to 2000 messages per thread but it still deleted our entire inboxes even though be hadn't reached our limit. This is so incredibly irritating! Called Verizon and they had no answer for me, other than to do a phone restart! Ugh! Any advice would be helpful! Thanks!