Start with habits, not specifications
Spec sheets are written to be compared, not to be understood. A more useful starting point is a short, honest list of what you do on the device every day. Calls, messages, maps and photos? Long video sessions? Reading and note-taking? Mobile games? Each habit leans on a different part of the hardware, and most people find that only two or three parts matter to them.
It also helps to decide early whether you need a phone, a tablet or both. A phone is the one device you carry everywhere. A tablet earns its place when a bigger screen makes a real difference, for example reading, drawing, video or video calls propped on a table. If you already own a laptop and a phone, a tablet is often a comfort purchase rather than a necessity, and it is fine to treat it as one.
Screen: size, type and smoothness
Size is the most personal choice. A larger phone screen is easier to read and watch, but it is harder to use one-handed and heavier in a pocket. If possible, hold a few in a shop before deciding.
Beyond size, two things shape how a screen looks. The panel type, usually LCD or OLED, affects contrast and black levels. The refresh rate affects how smooth scrolling feels. Both are covered in detail in our piece on how phone screens work, and the short version is that a good panel of either type is perfectly usable. Brightness matters more than many people expect if you often read outdoors, so look for reviews that mention it in sunlight rather than relying on a headline number.
For tablets, screen quality tends to matter even more, since the display is most of what you are buying. Check whether it laminates the glass closely to the panel and how it handles glare, because tablets are often used near windows and lamps.
Storage: buy for the long run
Storage is the spec people most often regret. Apps, photos, videos and offline downloads grow over the years, and the operating system itself takes a share before you add anything. Our explanation of phone storage shows how the gigabytes are divided, but the buying rule is simple: if you take many photos and videos or install large games, choose the larger option, because most phones cannot be expanded later.
If you mostly stream, message and browse, a smaller tier can work, especially when your photo library is backed up to cloud storage and older items are removed from the device. Be realistic, though. A phone that is nearly full from the first week is a common reason behind phone slowdown and constant clean-up chores.
Battery: capacity is only part of the story
Battery capacity is usually listed in milliamp-hours, and a bigger number generally suggests longer use between charges. But screen type, processor efficiency, software and signal strength all change real-world endurance, so independent reviews that run the same test on several devices are more informative than the label alone.
Think about how you use the device. If you are away from a charger most of the day, battery life should rank near the top of your list. If you charge nightly at a desk, it matters less. Also remember that every battery wears with use; our guide to battery health explains what the percentages in settings do and do not tell you. A device from a maker that sells replacement batteries or has a clear repair programme is a quiet advantage over several years.
Software support: the part buyers forget
Two phones with identical hardware can be very different purchases if one will receive security patches for years and the other for far less. Manufacturers publish how long they promise updates, and the promise varies widely between brands and price tiers. Look for the stated period, not a vague assurance.
This matters because regular software updates are one of the main protections against known security flaws, and a device that stops receiving them slowly becomes a riskier thing to use for banking or email. The choice between a mobile operating system from Apple or one built on Android also shapes how updates arrive and how long they continue, which our comparison of the two covers.
The cameras, connections and other extras
Cameras are heavily marketed, but photo quality depends on sensor size, lenses and software processing more than on megapixel count, as our article on camera sensors explains. Decide which type of photo you take most, such as family snapshots, low-light scenes or close-ups, and read sample comparisons for that situation.
Other details worth a quick check:
- SIM options: whether the device supports a physical card, eSIM plans, or both.
- Charging: which charger is included, if any, and whether wireless charging matters to you.
- Water and dust resistance: a rating helps with spills and rain but is not a guarantee.
- Accessories: cases, screen protectors and, for tablets, keyboards or pens may be limited for older or less common models.
Matching a device to a habit
A few common patterns show how the choices fit together.
- Mostly calls, messages and maps: a mid-priced phone with strong update support and a good battery usually serves better than a flagship.
- Heavy photo and video use: prioritise storage and camera quality, and plan for backups.
- Reading, study and note-taking: a tablet with a sharp, comfortable screen and a keyboard option may be worth more than extra processing power.
- Children or a first device: durability, a modest price and parental controls often matter more than raw speed.
Price is a trade-off across all of these, not a measure of fit. Last year’s model, bought new or from a reputable refurbisher, often delivers most of the experience for noticeably less, provided its update period has not nearly run out. Whatever you choose, outcomes vary from one unit to the next, so check the return policy and test the device during that window.