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 Cayman Islands

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Sold byAmazon Cayman IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗 Elevate your drive with the ultimate phone mount—secure, sleek, and always in view!

UNBREAKABLE GRIP 🦾 - Super suction cup locks your phone mount firmly on any flat surface—no slips, no worries.
360 VIEWING FREEDOM 🌀 - Seamlessly rotate your phone to any angle for optimal navigation and hands-free calls.
UNIVERSAL COMPATIBILITY 🌍 - Fits all major smartphones from iPhone 8 to 17 Pro and Samsung Galaxy series—one mount for all.
CUSHIONED PHONE PROTECTION 🛡️ - Soft silicone pads shield your device from bumps and scratches during every ride.
EFFORTLESS ONE BUTTON RELEASE 🔘 - Quick, intuitive phone insertion and removal with a single press—drive distraction-free.

The Blukar Car Phone Holder features a powerful suction cup base for rock-solid mounting on dashboards or windshields, a 360° rotatable ball for customizable viewing angles, and soft silicone padding to protect your phone from shocks and scratches. Compatible with nearly all smartphones between 4.0 and 6.7 inches, it offers easy one-button release for quick phone access, making it the perfect blend of durability, convenience, and universal fit for any vehicle.

Specifications

ASIN	B0B55QHZM8
Arm Length	8.26 Inches
Best Sellers Rank	4 in Mobile Phone Automobile Cradles
Brand Name	Blukar
Colour	Black
Compatible Devices	Fits 99% of vehicles, including pickup trucks, vans, SUVs, sedans, sports cars, and tractors. Compatible with major brands such as Vauxhall, Ford, Volkswagen, Toyota, BMW, Audi, Mercedes-Benz, Nissan, Peugeot, and Citroën.
Compatible Phone Models	iPhone 18 Pro/ 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	4.4 4.4 out of 5 stars (10,458)
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
Product Features	Adjustable
Water Resistance Level	Water Resistant

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