I found some problems with the samsung phones i am using. Specially on java. These mobiles are not better than nokia. Low memory could be a big reason for that. I am writing how to troubleshoot when your java software is stuck in the middle of something.
If OPERA MINI doesnt connect to internet after you have pressed allow internet access. Its like frozen. Press exit button once. It will ask exit yes or no. Press no. And click yes for allow internet access. You will go.
similarly sometimes samsung phones says verification of date time failed. Exit the application and change date setting to other date format. I.e from mmddyy to yymmdd, and viceversa. Always install a program which is smaller than 200kbs for such phones.