Comparison Lenovo K6 Power Dual 16 GB / 2 GB vs Lenovo K6 16 GB

The ratio of the screen area to the total front panel area of the phone. Simply put, this spec describes how much of the front panel is occupied by the screen; the rest is the bezels.

This indicator is given exclusively for smartphones with touch screens — it is for them that it is most relevant. The larger the percentage of the body is occupied by the screen, the thinner are the bezels, the neater the smartphone looks and the more convenient it is to work with it with one hand. As for specific numbers, the average values are 80 – 85 %, the higher values allow us to talk about a thin bezel, and more than 90 % — about a “bezel less” design.

Separately, we note that this parameter has nothing to do with the aspect ratio of the screen. The aspect ratio describes only the display itself — its proportions, the ratio between the larger and smaller side of the rectangle.

The quantity and types of removable cards (SIM, memory cards) that can be installed in the phone. On E-Catalog this parameter is specified only for devices that allow the installation of more than one SIM card — most often that means 2 SIM cards, however, you can find devices with three or even four corresponding slots.

Initially several slots mean that several phone numbers can be used on one device. Thus it is possible to combine personal and work numbers, separate plans for calls and the Internet, etc. in one device. However modern devices (especially smartphones) often provide the combined design “SIM + SIM / memory card " : one of the slots is intended only for SIM, the second can be used both for a SIM card or for a memory card such as microSD or Nano Memory (see "Memory card slot"). At the same time, there is no separate slot for a memory card in the device, so the user has to choose between the second number and additional storage. Therefore, if you want to use 2 SIM cards and a memory card at the same time, you should pay attention to models where this is directly stated.

It is also worth considering that individual slots may differ in the type of compatible SIM cards; see below for details.

The type of SIM card used in the mobile phone. The term SIM here means all types of cards for identification in mobile networks, including 3G networks, CDMA, etc. (although formally such cards may have other names). The type of such a card is primarily described by its form factor. Here are the most common options:

— micro SIM. The largest type of sim cards widely used in modern devices: its' size is 15x12 mm. It was introduced back in 2010, nowadays it is being replaced by more compact and advanced nano-SIM and eSIM. Keep in mind that a microSIM card can be made by simply cutting a larger mini-SIM to the dimensions mentioned above. However this is associated with a certain risk and requires accuracy, so it is better to contact your mobile carrier to replace the SIM card with a suitable one.

— Nano-SIM. The smallest form factor of classic (replaceable) SIM-cards is 12x9 mm. In such cards the frames are cut off almost to the very chip. This standard appeared back in 2012, but it is still extremely common. Like microSIM, a card for a slot of this format can be made by cutting a larger SIM card, but this requires extreme accuracy and is not recommended.

— e-SIM. This type of SIM card is an electronic module that is built directly into the device and cannot be replaced. To authorize in the network of a mobile carrier, you need to make the appropriate settings in the eSIM. T...hose modules are able to save several sets of settings at once, which makes it easy to switch between different carriers — no need to bother with the physical replacement of the SIM card, just change the profile in the settings. Another advantage of such modules is compactness. However, before buying a phone with an eSIM, you should clarify whether this technology is supported by your mobile carrier — even nowadays, not every network is compatible with such modules.

— nano+eSIM. An option found in smartphones with two SIM cards. The built-in eSIM module in such a device is complemented by a slot for a replaceable nanoSIM card. The features of each of these card types are detailed above. It is convenient to keep the main phone number (s) on eSIM, and use replacement cards for temporary numbers. Such scenario may come in handy if you travel abroad a lot — you can install cards from local carriers in the traditional nanoSIM slot.

The capacity of the battery that the mobile phone is equipped with.

Theoretically, the high capacity of the battery allows the device to work longer on one charge. However, actual battery life time will also depend on the power consumption of the gadget — and it is determined by the hardware specs, the operating system, special solutions provided in the design, etc. So in fact, phones with capacious batteries in general have "long battery life”, however, the actual battery life can differ markedly even for two models with similar specifisations. Therefore, for an accurate assessment, it is better to focus not on the battery capacity, but on the operating time in different modes directly claimed by the manufacturer (see below).

The materials of which the bezel (side edging) and the back cover of the device are made.

In our catalog, this data are indicated in two words — frame material and cover material. For example, a device with a glass back and metal edging would be labeled as "metal/glass" (bezel first, then lid). Two words are specified even if the same material is used for both elements — for example, "metal/metal" for an all-metal case.

The main bezel materials include plastic, metal, glass, rubber, and ceramics. Back covers are also made mainly of plastic, metal, ceramics or rubber, and among glass there is a special variety — Gorilla glass parts. Occasionally, more specific materials are used, such as leather. Here is a more detailed description of each of these options:

— Plastic. A fairly simple, inexpensive and at the same time versatile and practical material. Actually, nowadays there are many varieties of plastic on the market, which differ in price and practical properties; so that the general property of this material depends primarily on the price cat...egory of the device. The easiest way to give cover an unusual design is using plastic, although this design is also found in other materials. In general, all types of plastic in modern phones can be divided into glossy, matte, fluted and soft-touch. The gloss looks the shiniest, but dirt is very noticeable on it (first of all, fingerprints), moreover, such cases tend to slip in the hands. Matte surfaces are not as good-looking, but they are less sensitive to dirt. Soft touch is a special kind of matte plastic: due to the specific surface texture, this material is perceived as soft to the touch, similar to rubber. Also, it is perfectly held in the hands and almost does not slip. Fluted plastic is considered the most reliable in this regard — with signature notches on the surface; however, not everyone likes the look and feel of such surfaces when held.
As for combinations with other materials, plastic frames can be provided in metal and glass cases — for a secure hold; and plastic covers can be supplemented with metal or rubber frames for increased reliability.

— Metal. Usually metal most often means aluminium alloy. This material combines high strength, low weight and good thermal conductivity (the latter is especially important for removing heat from the hardware of performant smartphones). Metal cases are relatively rarely made in bright colours, but such a design is also possible; in addition, even without additional coloring, this material looks good. In general, it costs more than plastic, but nowadays even low cost phone models can be made of metal. At the same time, the metal frame can be combined with almost any cover material, however, such frames are especially popular in models with a glass back panel — the metal gives the case additional strength. Metal covers are found mainly among all-metal cases, less often in combination with a plastic frame (it allows you to reduce the cost and improve the permeability of the case for communication signals).

— Glass. Phone cases usually use special tempered glass of increased strength (a special kind of such glass — Gorilla Glass — is indicated separately, see below). Theoretically, glass is more sensitive to shock than most other materials, but in fact it is still quite difficult to break such a surface. At the same time, these cases look quite stylish and unusual. Their disadvantages include a rather high cost, as well as the signature features of glossy surfaces — the tendency to slip out of hands and "collect" dirt, especially fingerprints. In terms of specific body parts, glass is most often used for back covers; they are often complemented by frames made of more durable material (usually metal). But glass frames are usually part of all-glass cases — other design options do not make sense for a number of reasons.

— Gorilla Glass. A special type of high-strength glass from which back covers can be made. For glass in general, see above; and Gorilla Glass features are detailed in the Main Display section. We only note that, as in displays, different versions of such glass can be used in the rear panels of the case, differing in resistance to shock and scratches.

— Rubber. Usually, in this case we are talking about a body or a frame made of a hard material (plastic or metal) with an additional rubber coating. The use of such a coating is an unmistakable sign of a phone with a high degree of protection — waterproof, and often also shockproof. Rubber is the optimal material for such devices: it perfectly resists both moisture and shock, well insulates the hardware from cold and heat, while such a surface is pleasant to the touch and does not slip in the hand. The main drawback of this material is its bulkiness: the rubber coating must be quite thick, so that it noticeably affects the dimensions of the device. Thus, it makes sense to pay attention to this option in occasions where security is more important for you than compactness. At the same time, we note that the rubber case can be combined with a metal frame, and the rubber frame can be installed on a plastic device; these options also turn out to be quite reliable.

— Ceramics. Ceramics is material made by sintering raw materials at high temperatures. Mobile phones use special high-strength types of such materials. The advantages of ceramics include a stylish appearance and good reliability in most situations. On the other hand, such compositions are still quite sensitive to impacts (especially point impacts), they tend to slip in the hands, and they are not cheap. Therefore, ceramics is rarely used in modern mobile phones — mainly as a fashion material in fairly advanced models. Most of these models combine a ceramic lid with a metal frame; all-ceramic cases are noticeably less common.

— Leather. A rather rare and specific material, used mainly as a design solution. Leather covering in such cases is provided for the back cover, while the frame is made of metal or plastic. This material gives the device a solid appearance, emphasizing the status of the owner; in addition, it is pleasant to the touch and does not allow the device to slip out of the hand. However, leather is expensive and not reliable: it is easily scratched and torn even with light contact with sharp objects, and is also prone to abrasion. Therefore, such cases are not popular even among high-end phones.