We are writing this useful Symbian Mobiles Tutorial because many people ask for signing unsigned applications / games but missing their needed Certificate, Key files (.cer & .key) for installing free downloaded .sis / .sisx Applications and games with their mobile iMEi # . So this short tutorial via screen shots guide you how to get your Symbian .cer and .key files for installing apps & games with free online.
Update: New Method to Kill Certificate & Key Files Sign Error Forever
How to:
1) First register OPDA Certificate site and login to your account.
2) After signing in, Click on My Certificate Link as screen shot below (Click to see Zoom)
3) Now click Apply .cer button.
4) Now complete the required information for your mobile model and IMEI#. 
5) Finally submit your application and your required .cer, .key files will be ready for download in few hours.
Note: One certificate and password key file always unique for one IMIE #, download these certificate and key files and save them with you forever which will help you to sign any application any time.
Now you can sign your unsigned .sis or .sisx files from Signing Soft link with the help of Certificate, Key files or you may also use SIS Signer v1.x and Pot Sign Tool PC Applications for this purpose.
Update: New Method to Kill Certificate & Key Files Sign Error Forever
IMEI : 354856047078180
FOR NOKIA E71
YA ALI MADAD. /THANKs.
serial number 358741022270935 i8910e cer key files send a@ymail.com .thanks
i need cer and key for my nokia 5228
IMEI : 355395043112296
Please send me cer and key.
Thank you
Please..it’s been more than 10 days now
thanks for your moderate work on this for Symbian OS users. I appreciate your excellent work and continue to put your effort on 3d games cracking.
Thanks & bi.
Venkatesan
hi
plz send me the file key and certificate
nokia c6-01
imei no. is 353759043564453
nokia c5-03
358620043042392
tnx
Hello,
Please send me the certificate and key for my Nokia E5 serial no:357413042485965
Hello,
Please send me the certificate and key for my Nokia E5 serial no:357413042485965
email:stan4babes@gmail.com
Iam using nokia 5233 and imei number is 358269045475992 ply send me cer and key my email id is younisdal@gmail.com thanks.
hi.. i try 2 get d cer.key by OPDA but its not response. pls send me d cer.key, my IMEI: 357901040668756 i using c6-00
thx b4
Try our new method to kill this error forever plz.
help! follow up my cert and key hires my imei 358361000042055 sent to my email jeromenaprada@gmail.com.thnx
urgenly need a cer nd key for my vivas pro,,,,plzzz,,
IMEI:012305007024473
m using nokia N97 Mini my imei no. is 351979040771867
… i hav registrd through opda… but 2 weeks hav passed i didn get my certificates… plz help… my email hasnat2000pk@gmail.com
Thanks for helpful information but other method Kill Certificate error is better.
Nokia e5 imei 354859045131456 umetnik_86@yahoo.com…please help bothering with this for a long time and too stupid to isnatlll it myself…tahnks
nokia n95
354835012738192
Thanks for Cer & key
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hi everybody
how can i get cer and key for any cell phones ?
thanks