best keyboard for Farsi on iphone 4S

This is the best keyboard for iphone 4S. I have tried literally ALL of them that are out there now (except the most recent 2 of them that are awful when looking at their layout). The last update made me rank this one first. Reasons: it has "half-space". it has double tap on space to give dot. It has comma by a dobble click. It maginifies the keys as you type them. and finally: IT IS FASTER WHEN YOU SWTICH which is a big deal for older phones.

MohMahG about Black Keys