Some old P800's don't recognise signed .sis files with newer signatures. thus will not install piAccess Link 0.9.
The irony is that although piAccess Link is not signed this still is a problem because it contains a Symbian Signed .sis file with the Mobinfo library.
Until Symbian release one .sis that isn't signed, the piAccess Link .sis file may include the Mobinfo.dll directly in its installtion file without signing. This is ok with the terms of usage, given by Symbian Developer Network.
This dll is found in the mobinfo.zip under the Mobinfo-1.01-v7-SEMC/epoc32_armi_urel folder.