How to find whether a phone is symbian or not

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Hi guys

Before i started blogging i always wanted to find  whether a phone is symbian or not
I searched,  searched,  searched but never found then i gave up the topic
Ok here are some of their features

1. The price of them is usually more than 5000
2. They have a home button 
3. Go to manufacturer's web sire (usually something like www.manufacturer_name.com) and check their products. Once you find yours, check device's specifications and see if they mention Symbian.
4. If u long press the center button or press the home button(long press) U will see an open applications box
5. They install sis files 

Thanks for seeing