Nokia 8110 4G comes with 512MB RAM and 4GB internal storage. Hence, just like your Android phone, it has phonebook with unlimited storage.
No. Nokia 8110 4G does not have the wireless FM radio.
Yes, Nokia 8110 4G does have the support for the Facebook App.
Nokia 8110 is 133.45 mm ( 13.34 cm) long and 49.3 mm ( 4.93 cm ) thick.