Step 1: Things You Need
2. Hand shower holder
4.Bath mixer with a hand shower attachment
The third picture is to show the suction cup.
Step 2: Disconnect the Mobile Holder.
After removing the mobile holder there should be some free, flat surface where the hand shower holder can be attached.
Step 3: Fix the Hand-shower Holder.
You may need some additional reinforcements as the hand-shower may be a little heavy.
I used a wire support.
Step 4: Assemble and Attach It in the Bathroom
Find a place in the bathroom (preferably overhead) where the suction cup can be attached.
Put the hand-shower over on to the holder.
Adjust it's height and position as you like.