I never have found out why it seemed to take several tries to get it to mount a card.  It's happened with other cards since the review.
 
A few things to try:
 
-- Did you format it vfat or fat 16?.  Try other format options.
-- If you formated it on Wndows, try a Mac, and vise-versa.
-- Try formatting it in another mobile phone, media player, or camera that supports formatting a card.
--- Create the same default directories as on a working card.
 
Sorry I don't have the answer, but if you figure it out, please post here.  

I formatted the tf card in a camera using a SD adapter. But the phone did not recognize it, still.
I bought a tf card of brand Sandisk. Nothing changed.
I really doubt that if it is the phone's problem in itself.  
It is really driving me to mad.

A 1G TF card is used now. It seems that 2G TF card is not supported.  
The folders created by the phone include one named ebook. It seems that there used to be a software to read ebook. Does anyone know what was it? Or what software can be used instead?