8051 smart card design
Your start up sequence is wrong.

The correct procedure is:


Power the card AND apply clock while reset is low
keep reset low for at least 40000 clock cycles
set reset high


Then the card has to start sending the Answer To Reset (ATR) whithin max. 40000 clock cycles.

For further information take a look at the specifications

Here you can find about what ISO/IEC 7816-3 says.

Here you can download the ETSI standards for free.
The one relavant for you is 
ETSI TS 102 221
"Smart Cards; UICC-Terminal interface; Physical and logical characteristics"