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Hi,
This happened to me two days ago. After reading through the whole thread, one of the replies (on the previous page) clicked with me.
Just before this happened I got a message on my phone saying 'Running out of Memory on Phone'. I of course was busy and ignored it.
But it seems this was the issue and the phone has automatically deleted what it thinks was non-essential stuff to create enough memory for it to run. Either that or the lack of memory crashed something irreversibly.
The HTC Sense trick works (only if you previously used HTC Sense) because it restores the backup of your messages (somewhat slowly) from their online backup centre.
Same if you restore a backup created by a backup app.
However - you will continue to have this happen again almost straight away if you do that as you'll fill your memory up again.
SOLUTION:
1-Move every app to SD that you can
2-Delete all those apps you don't use any more
3-Spring clean your messages and/or
4-Setup the Gmail sync as suggested above and then DO set up some auto delete options to remove old messages (as they will now be backed up). Or use an app to delete old messages occasionally.
Hope this helps.

Haven't had this on my Desire Z... doesn't restarting fix it?The past couple of times have been worse as they vanish and I am then not able to send a text...its been like this for 6hours now...i need to be able to send a text with the darn thing!!
Haven't had this on my Desire Z... doesn't restarting fix it?
Hi DVDfever,
It could be that your memory is still so full it can't restore everything. Either way, might be worth deleting some apps/messages or moving apps to sd and trying again. If you have app brain installed its easy to move apps to sd - just look at your list of apps and click on everything that says 'on phone'
Can anyone beat losing texts twice in two days?
When are we getting Android 2.3?

I had thousands!
My Htc Desire is deleting my text messages whithout me wanting it to do so. This is so frustrating! Anyone having the same problem? Is it my SD card it's something wrong with? Or what could be the problem?
Cheers, Erik
This just happened to me too, for the second time. Also, my HTC "forgets" the wireless hotspot settings all the time, but this is obviously not as much of an issue. SMS erase is one of those things that just shouldn't happen, and HTC failed to resolve the issue over a period of at least a year.