Youcan install a signer application straight onto your 5800, and sign iton your phone. To do this, we’re going to use an application calledFreeSigner, which you can download from below

Using FreeSigner is really simple;

Pre-requisites:

FreeSigner (download link below).
your developer certificate (you can request for your certificate and key file from us)

COMPLETE STEP BY STEP FOR SIGNING PROCESS:

Copyyour developer certificate and key file into a directory on my memorycard, in the “Certs” sub-folder under the “Documents” folder, so it’slocated in “E:\Documents\Certs”,

Place it anywhere you can find it easily later.

Havinginstalled FreeSigner on your phone, launch it from the “Applications”menu. You need to configure some settings first. Tapping “Options” -“Settings” will bring up the following screen:

Ignorethe items which say “Self sign” in front of them. Self signing may wontwork for a lot of applications, so it is importnat that you have yourown certificate and key file for signing all application / games /themes. and for which you can place your request here by posting yourIMEI umber.
Now, tap on “Sign Cert”. FreeSigner will nowprompt you to select your certificate file, usually a file whoseextension is “cer”. Select this file, and its name will appear like inthe screen above.
Next, tap on “Sign Key”. FreeSigner will nowprompt you to select your certificate file, usually a file whoseextension is “key”. Select this file, and its name will appear like inthe screen above.
Next, if the person who supplied you with thedeveloper certificate also mentioned that to use the “key” file, youneed a certain password, you need to enter it now. Tap on “Sign KeyPass” and enter the password given. If no password is needed, skipthis step.
Next, choose the directory where your signed filewill be placed. I normally just use the source directory, ie. whereveryou put the unsigned file, FreeSigner will sign it, and put the signedfile in the same directory as the unsigned file. Makes life easy.
Next, tap “Back”.
Tochoose the file for signing, tap on “Add Task” and you will see ascreen which asks you where the file is located. Choose the drivewhere your file is (C = phone memory, E = memory card), then choose thedirectory where the file resides as in the screen below.

Then, tap once on the file, and tap “Options” – “Add” as in the screen below.

Then,select the type of operation to be performed on the file, in mostcases, actually, for me, for all cases I would select “Sign Sis”because my testing tells me that “Self Sign Sis” is useless and doesn’twork most of the time!

You are now brought back to the “main” screen, where your file to be signedappears as a “task” to be carried out by FreeSigner. The final stepwould be to tap “Options” – “Go” and your file would be signed!

Now,look for your signed file wherever you configured FreeSigner to put it- if you chose “Same As Source” in “Output directory” in the settingsscreen, then the signed file will be in the same directory as yourunsigned file. The filename will have “_signed” appended to the end ofthe file name, like below:

Inyour built-in File Manager application or a third party file managersuch as Y-browser (my favourite!), look for the file, tap on it once toinstall, and you’re done!

Free Signer