In as much as most smartphones come with great specs - big screens, fast processors and great software, this can only mean "the better the specs, the better the battery has to be". This is because the sophisticated components and software in a phone will surely consume a lot of battery juice. The battery capacity of any mobile phone you choose to use should be reliable.
2000mAh (Milliampere hour) batteries are good but will not last a day if your connection is on 3G, or you are a techy or social media lover who can't do without staying connected to the internet community. Batteries that range between 3000mAh and above are the surest nowadays especially for busy people who don't have time to charge up their phones during the day or those who live in locations where power supply is very limited.
Phones come in different sizes which suit different people.
Compact Size (Below 4.5 inches): Many phones, including the 4-inch iPhone and the 4.3-inch HTC One mini provide smaller, more pocket-friendly form factors.
Standard Size (4.5 to 5.1 inches): This is the mainstream size for flagship phones such as the Galaxy S5, Nokia Lumia and HTC One.
Large Devices (Over 5.5 inches): Large devices are also known as "phablets" (phone + tablets). They have bigger screens, which provide a generous viewing area and easier on-screen typing. An example is the iPhone 6 plus. Sometimes, they can be bulky.
These days, most people are comfortable with phablets. This is because users have a better experience when watching videos or playing games on the smartphone. If you are used to standard or compact size, you may want to push your limits to go for a bigger screen.
Operating systems in various smartphones serves a major role and may possibly determine if you can even handle the device. The four (4) most popular types of Operating systems or OS are - Android OS, Windows OS, iOS and BlackBerry OS. They all have their pros and cons.
Android OS has been all over since it arrived in cheap smartphones like Tecno in 2012.
Windows OS is found on Windows phones, the experience is very similar to the one on our Windows PC.
Apple iOS is an operating system from Apple Inc. seems to be one of the most sophisticated among the others, despite its beautiful and rich looking user interface.
Blackberry OS is an operating system is found on BlackBerry Devices. The operating system is as secure and personalized as that of Apple's iOS. In a way, Blackberry OS is a bit more flexible than iOS since it supports sharing files and data.
Storage and Expansion
Smartphones run with storage capacities which determine how much data it can save. Along with the processor, it can also determine the speed of the device you want to use. There are 2 memory storage found in smartphones—RAM (Random access memory) and ROM (Read-Only memory). The higher the RAM, the faster your mobile device will run; the higher the ROM, the more space you will have to store file or data in your phone.
A good Smartphone also comes with option for expandable memory where you can slot in your memory SD card just in case the internal memory (ROM) gets full.
This is important because most people love to take pictures and it is better to take clear photos. Smartphones with at least 5MP back camera are good, although the new models are coming with a better megapixel, like 8MP and higher. Good smartphones also come with at least 2MP front camera for taking selfies and performing video calls.