The Original Imagnet Cradle-Less Universal Car Phone Windshield Dashboard Mount Holder for iPhone 6, 6 Plus (6+) , 5s 5 4s, Galaxy S5 S4 S3, Note 2 3, HTC One

Will this hold a phone with a 5.5 screen?
A:Yes,and it can also hold Mount For iPhone 6/5s/5c/4s, Galaxy S5/S4/S3/S2, HTC One & All Smarthphones,tablet computer And Gps Devices

Does it come with the metal plate for the phone or I need to buy it separately? 
A:No,you do not need to buy anything else

Isn't it bad to have a magnet so close to your brain when actually making calls???
A: The magnet is one-way magnet which doesn't bother your brain or reception
Will the magnet affect a navigation app such as google maps or Waze?
A:No,lots of our customers have used the google maps navigation on their phone with their phone mounted on it,
And it did not affect it any way.
Will this work if back of my phone is slightly curved? Like LG G3.
A: The suction cup is pretty powerful although the inserts are not curved.

Does it need to take the holder off when you try to take the phone off ?
A:No,you just need to take the phone off along with the top part of the mount without fumbling with any mechanisms,is very flexible and easily.
Can the phone swivel on the mount?
A: Absolutely yes, it has no dead Angle and can adjust 720 degrees
Will this hold android tablet? 
A:Yes,but the suction cup will fall off the windshield with some regularity if the weight Up to 1kg.
I recently purchased this product and am having problems with it staying stuck to my dash. I have a Chevy HHR which has a textured dash?
A:Our mounts only suitable for smooth and clean surface of the material,  we suggest you clean the area with rubbing alcohol push it down and then lock the rotary switch.
And,now our engineers are designing the new model of which the suction cup on the base is made of a sticky material that can stick to textured surface like your dashboard,please look forward to!