This solution:
http://talk.maemo.org/showthread.php...28#post1321128

Is much better than putting anything between sim card and cover. While it may help at the beginning, additional "bending" of PCB due to added thickness, may result in worsening over time.

While springs under EMI shield are also workaround, no "proper" fix (which would be reflow), it's still much more sane, than stuffing things under cover, or hammering randomly.

/Estel