Galaxy A21s vs Galaxy S20 Ultra
Shop Samsung Galaxy
Galaxy A21s
Starting at
£60.24£219.00 new
Galaxy S20 Ultra
Starting at
£269.45£1,199.99 newWhat's the difference between the Galaxy A21s and Galaxy S20 Ultra?
Galaxy A21s vs S20 Ultra comes down to the RAM, screen size and screen type. Refurbished, the Galaxy A21s starts at £60.24, £209.21 less than the Galaxy S20 Ultra.
Refurbished from
RAM
Screen size
Screen type
Main camera
Front camera
- The Galaxy S20 Ultra has more RAM: 12 GB vs 3 GB.
- The Galaxy S20 Ultra has a bigger screen: 6.9 inch vs 6.5 inch.
- The Galaxy S20 Ultra has an OLED screen.
Galaxy A21s vs Galaxy S20 Ultra specs
The Galaxy A21s and Galaxy S20 Ultra both come from 2020 and share a large 5000 mAh battery and Android OS. The Galaxy A21s suits everyday use with its 3 GB RAM and lower resolution 720 x 1600 PLS LCD screen on a 6.5 inch display. It offers practical features like a single physical SIM and microSDXC slot. The Galaxy S20 Ultra is geared towards users who want more power and premium visuals, with 12 GB RAM, a larger 6.9 inch Dynamic AMOLED 2X screen at 1440 x 3200 resolution, and dual SIM support. It also has higher resolution front and main cameras and more storage options. Both devices work on 4G and come unlocked, appealing to different needs based on performance, screen quality, and camera detail.
Galaxy A21s vs Galaxy S20 Ultra price
Colour
Galaxy A21s vs Galaxy S20 Ultra battery life and software updates
Battery life and software updates play a part in how long a phone stays useful.
Battery Capacity
Both the Galaxy A21s and Galaxy S20 Ultra have a 5000 mAh battery. This means either device can provide a similar amount of power for daily use, making them suitable for long periods between charges.
Battery
Fast charging
Foldable
Software updates
Year of release
Galaxy A21s vs Galaxy S20 Ultra performance
Chipset
RAM
Galaxy A21s vs Galaxy S20 Ultra screen
Screen size, resolution and type affect how you see your content. The Galaxy S20 Ultra has a larger and higher quality screen, while the Galaxy A21s offers a practical display on a smaller panel.
Screen Size
The Galaxy S20 Ultra has a 6.9 inch screen, which is noticeably larger than the 6.5 inch display on the Galaxy A21s. This extra space makes the S20 Ultra better suited for watching videos or multitasking on a bigger display.
Screen Resolution
The Galaxy S20 Ultra's screen offers a much higher resolution at 1440 x 3200 pixels, producing sharper and more detailed images than the Galaxy A21s, which has a 720 x 1600 pixel resolution. This makes the S20 Ultra a better choice for photo viewing or reading small text.
Screen Type
The Galaxy S20 Ultra uses a Dynamic AMOLED 2X screen, which delivers vibrant colours and deep contrast. The Galaxy A21s uses a PLS LCD screen, which is practical and clear but does not provide the same level of colour richness or contrast.
Refresh rate
Resolution
Screen size
Screen type
Galaxy A21s vs Galaxy S20 Ultra camera
Camera quality affects how well you capture photos and video calls. Both phones differ significantly in camera megapixels, which influences detail and clarity.
Front Camera
The Galaxy S20 Ultra has a 40 megapixel front camera, offering much higher detail for selfies and video calls compared to the Galaxy A21s's 13 megapixel front camera. This suits users who prioritise high-quality front-facing photos.
Main Camera
The Galaxy S20 Ultra comes with a 108 megapixel main camera, which captures more detail than the 48 megapixel camera on the Galaxy A21s. For those who take many photos or want sharper images, the S20 Ultra provides a significant advantage.
Camera type
Front camera
Main camera
Galaxy A21s vs Galaxy S20 Ultra size and design
Other practical differences include storage, SIM options and physical size. These affect how you use the phone day to day.
Storage Options
The Galaxy A21s is available with 32GB or 64GB of storage, which fits everyday use and app needs. The Galaxy S20 Ultra offers 128GB storage, making it better for users with large apps, photos or media collections.
SIM Card Setup
The Galaxy A21s supports a single physical SIM card, while the Galaxy S20 Ultra supports dual physical SIM cards. Dual SIM is useful if you need to manage two phone numbers or networks on one device.
Size and Weight
The Galaxy S20 Ultra is slightly larger and heavier at 166.9 mm tall, 76 mm wide, and 222 g, compared to the Galaxy A21s's dimensions of 163.7 mm height, 75.3 mm width, and 192 g weight. The A21s may feel easier to handle for those who prefer a lighter phone.
Expandable Storage
Both phones support microSDXC cards to expand storage, allowing you to add more space for photos, apps or files according to your needs.
Network Compatibility
Both the Galaxy A21s and Galaxy S20 Ultra work on 4G networks and come unlocked, giving you freedom to choose your mobile carrier.
Carrier compatibility
Connector
Depth
Height
Mobile network
Release date
SD card slot
SIM card
Weight
Width
Galaxy A21s or Galaxy S20 Ultra: which should you buy?
Buy the Galaxy A21s if
- you want to spend less: it starts at £60.24, £209.21 less than the Galaxy S20 Ultra
- you want a lighter build (192 g vs 222 g)
Buy the Galaxy S20 Ultra if
- you want more RAM (12 GB vs 3 GB)
- you want a bigger screen (6.9 inch vs 6.5 inch)
- you want an OLED screen
What our customers say
Customers who have bought the Galaxy A21s often mention that the phone looks like new and works well for everyday use. Many appreciate its condition and service, noting it is suitable for children or family members. Some users have experienced initial setup frustrations, but overall the phone remains reliable and good for basic tasks. Storage options like 64GB meet typical needs, and the phone's size and battery life are welcomed by buyers.
The Galaxy S20 Ultra receives praise for its excellent condition and responsiveness, with many customers happy with the screen quality and camera performance. Users find the phone fast and capable of handling multiple apps thanks to its 12 GB RAM and large storage. Some mention the phone's size and weight but appreciate the large display and high-resolution cameras. A few note minor issues with previous owner data but generally the phone satisfies those who want a powerful device with premium features.
Overall, the Galaxy A21s suits buyers looking for a straightforward, reliable phone for daily tasks and good battery life. The Galaxy S20 Ultra fits users who want a larger screen, more storage, and advanced camera capabilities for detailed photos and media use.
Galaxy A21s vs Galaxy S20 Ultra FAQs
Galaxy A21s vs S20 Ultra comes down to the RAM, screen size and screen type. The Galaxy S20 Ultra has more RAM: 12 GB vs 3 GB. The Galaxy S20 Ultra has a bigger screen: 6.9 inch vs 6.5 inch.
The Galaxy A21s is cheaper refurbished, from £60.24 compared with £269.45 for the Galaxy S20 Ultra.
Both have the same battery: 5000 mAh.
The Galaxy S20 Ultra has a higher-resolution main camera: 108 megapixels vs 48 megapixels.
The Galaxy A21s no longer gets updates. Updates for the Galaxy S20 Ultra ended in Mar 2025.
Refurbished, the Galaxy A21s comes in 32GB and 64GB, and the Galaxy S20 Ultra in 128GB.
