does .sis files support or not?

hello everyone,
being a new member to this site, i found it to be useful.
but these days my sister is using nokia e51 camera free phone..the problem she is facing is that she cant able to install the .sis files as always a message comes..feature not accepted..somewhat like this.

i also want a free call recorder to this e51 to find the calls she is calling or receiving.
do please reply me.
Thanks

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› See More: does .sis files support or not?

Your phone is a s60 3rd edition phone.Check the software is intended for s60 3rd edition.
This problem also occurs due to some mobile phone security reason.So pls check App.mgr > Options > Settingson phone and enable installation.

You will have to learn to only download and install applications which are specifically declared compatible with your phone in particular (i.e. E51) or its software platform release (S60 3rd Edition, aka S60 3.0).

If such an application fails to install on your phone seek help at the source of the application.

do you think thats the only problem when you already know what appz fit for symbian? how about certificate essue? you must know how to hack symbian for success apps installation. read my topic and follow instruction on how to hack.