Hi Anitha,
I'm sorry but "0245875224485" isn't a unicode format for anything but "0245875224485".
"Anitha" in unicode would again be "Anitha". I guess that when you try to convert Unicode to some ISO charset you will find out that it didn't help.
But let's stick to your specs. To convert a string from UTF-8 (say we're talking about UTF-8 here; "unicode" is rather a general word and can mean more than one thing) to ISO-8895-2 (I don't know what your "original" charset was) you can use iconv() function:
$converted_8895_2 = iconv("UTF-8", "iso-8859-2", $utf8_string);