Well, in fact you can easily recover the data directly on the phone using something like FExplorer and an hex editor just take a look at the files in the subfolders of C:\system\Mail (hint hint: you can also copy attached files over to anywhere on the FS from there) what really sucks about this "feature" is that these apparently "deleted" sms take space on the device with every attachment they have, even though they've been deleted and they won't be overwritten because as files, they haven't been deleted