I saw so many Users complaining about Free iSMS registration problem. I myself was so upset about it, one day my brother told me that he is using iSMS and he didn't face Registration problem. So i suddenly thought why its happening to me only? I googled about it and saw so many people, i felt that i am not alone :). So i decided to do something by my own. I tried only one method and it worked.

Let me tell you what i did. I simply took my brother's mobile from him and copied two files from his mobile.
C: / Data / FreeiSMS / FreeiSMS_0xXXXXXXXX.dat
C: / Data / FreeiSMS / FreeiSMS_0xXXXXXXXX.db
XXXXXXXX can be different in different version of iSMS.

Then i sent both files to my mobile and i pasted both files in
C: / Data / FreeiSMS /
Then i opened Free iSMS > Options > Login

Then i tried to Register it with my mobile number or e-mail and i succeeded. Now i am so happy that i am still using it and i am loving it <3. Here is the proof, i mean preview of my iSMS.