Will this fit a Galaxy a21s phone

Yes as it has adjustable clamp. I use it for s22 ultra which is huge.

Will this hold a phone that has a pop up handle on the back?

I guess all phones has a plain back unless you have added a phone cover to it,what I did was to always remove my phone cover each time I wanna place it on the device,and what I observed is the device is more firm when it's placed on the windscreen than placing its placed on the dashboard

How do I get it off from windscreen

Try pulling the little tab at the front. It should relieve the suction pressure. I've not had to remove mine, and I've also not got mine on the windscreen, but that should be what the tab is for. They have those tabs on most suction plates.

When attaching this to a dash, does it need to be 100% flat? I don't want it on windows/vents and my dash isn't totally flat.

Mine is not 100% flat either and it fits perfectly. I drive a Volkswagon Jetta

Adjustable Suction Mount | Desertcart Vietnam

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗 Elevate your drive with the ultimate no-fail phone mount—secure, sleek, and smart!

UNBREAKABLE GRIP 🧲 - Super suction cup locks firmly on any flat surface—no slips, no marks, just rock-solid hold.
360 VISION CONTROL 🌀 - Full rotation for perfect viewing angles—landscape or portrait, tailored to your driving style.
PREMIUM DURABILITY 🛡️ - Heat-resistant ABS+PC build with shock-absorbing silicone pads protects your phone from bumps and scratches.
UNIVERSAL FIT FOR ALL 📱 - Compatible with all smartphones from 4.0 to 6.7 inches—future-proof your ride with one sleek mount.
EFFORTLESS ONE BUTTON RELEASE 🔘 - Quick, intuitive phone mounting and removal with a single press—drive distraction-free.

The Blukar Adjustable Suction Mount is a premium car phone holder featuring a super-strong suction cup for unwavering stability on dashboards or windshields. Crafted from durable, heat-resistant ABS+PC materials and equipped with shockproof silicone padding, it protects your device while offering effortless one-button phone release. Its 360° rotatable ball joint and 8.26-inch adjustable arm provide customizable viewing angles for safer, hands-free driving. Universally compatible with smartphones from 4.0 to 6.7 inches, this mount is designed for millennial professionals seeking a reliable, stylish, and versatile in-car phone solution.

Specifications

ASIN	B0B55QHZM8
Arm Length	8.26 Inches
Best Sellers Rank	8 in Mobile Phone Automobile Cradles
Brand Name	Blukar
Colour	Black
Compatible Devices	Smartphones
Compatible Phone Models	Iphone 17/ 17 Pro/ AIR/ 16/ 16 Pro/ 16 Plus/ 15/ 15 Pro/ 15 Plus/ 15 Pro Max/ 14/ 14 Plus/ 14 Pro / 14 Pro Max/ 13 Pro Max / 13/ 13 Pro/ 12/ 12 Pro/ 12 Pro Max/ SE2020/ 11/ XS/ XR/ 8, Galaxy S20/ S10/ S10+/ S9/ S8/ S8+/ S7 and more
Compatible with Vehicle Type	Automobile
Country of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (10,132)
EU Spare Part Availability Duration	5 Years
Enclosure Material	Acrylonitrile Butadiene Styrene Polycarbonate
Item Dimensions	11 x 10 x 6.5 centimetres
Item Weight	176 Grams
Manufacturer	Blukar
Manufacturer Part Number	K9778
Maximum Weight Capacity	45 Pounds
Model Name	K9778
Model Number	K9778
Mounting Type	Dashboard, Windshield
Product Features	Adjustable
Water Resistance Level	Water Resistant

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