Long press means "press and hold on" until you see a menu pop up. From that menu select "Delete thread" (3rd Option).
If you are finding that is too difficult for you, then open the thread and click on the menu button --> More --> Delete thread option to delete that entire thread.
Hope this helps.
Xperia X10i Sensuous Black running Original unbranded 2.1.A.0.435 Firmware. Rooted, xRecovery & using X.Gbread theme. Quadrant-764 & Linpack-34.148 MFLOPS
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Might be an idea to do a small write up about it here, that way if anybody else has the same problem they can refer to this thread instead of starting another.
Hi, I know this is an old thread but just wondered if "Prime" is still about & cares to share the secret of how to delete whole text threads as opposed to deleting 1 at a time.
Anyone else know how to do this. I've got an X10 mini with the default SMS service that came with the phone.