While we think to buy a smartphone we think about different aspects like camera,display size processor,RAM,but we miss to notice internal memory or we compromise their because of there is expandable memory option
While choosing a smartphone always think about storage it's very imp factor while thinking about smartphones, it no use of large high end smartphone if u dont have enough storage to download apps ,photos,songs,videos etc..
while thinking about SmartPhones storage it comes in two parts internal Storage and External Storage
if your phone's internal memory is low it will limit the amount of apps you will be able to install on your phone. Even though some of them can be installed in memory card , a small part of every app will reside in the internal memory of the phone.This will create trouble since the apps are getting bigger and bigger every day. Even the basic apps like YouTube Gmail or Maps receive massive upgrades periodically that takes memory.If you are buying high-end phones, you may not have to worry about this since they comes with enough memory. But don't forget to consider internal memory while you go for low end android device, otherwise you will miss the real benefit of the android Phones.
Many phones are now supports huge size SD cards but are they really effective ?
it depends what kind of data we are storing on the card if we are using for regular data like songs photos low quality video for that Class 4 is sufficient if u are thinking recording high definition videos so u should have better Class SD card.
now what is Class of SD card
SD memory card manufacturers use different types of flash memory to create an SD memory card, so actual transfer speed can vary. Varying speeds make it difficult to determine which card will provide reliable recording of streaming content. Recording video require a constant minimum write speed to ensure a smooth playback. The SD Association defines Speed Class standards indicated by speed symbols to help consumers decide what card will provide the required minimum performance for reliability. There are two kinds of speed indications regarding SD bus generation:
Speed Class and UHS Speed Class* symbols indicate minimum writing performance to ensure smooth writing of streaming content such as video shooting. This is important mainly for camcorders, video recorders and other devices with video recording capabilities.
Speed Class designates minimum writing performance to record video. The Speed Classes defined by the SD Association are Class 2, 4, 6 and 10.
UHS Speed Class is designed for UHS** devices only and designates minimum writing performance to record video on UHS products. The UHS Speed Classes defined by the SD Association are UHS Speed Class 1 (U1) and UHS Speed Class 3 (U3).
* (Speed Class and the UHS Speed Class are not compatible.)
**UHS (Ultra High Speed), the fastest performance category available today, defines bus-interface speeds up to 312 Megabytes per second for greater device performance. It is available on SDXC and SDHC memory cards and devices.
It’s important to remember that Speed Class and UHS Speed Class are two different speed indication symbols for different devices. However, a UHS-I memory card may also indicate a Speed Class.
The host device Speed Class requirements are minimum requirements for optimum performance. If your host device requires a Speed Class 4 SD memory card, you can use Speed Class 4, 6 or 10 SD memory cards. If your host device requires a Speed Class 6 SD memory card, you can use Speed Class 6 or 10 SD memory cards.
The memory of a card is divided into minimum memory units. The device writes data onto memory units where no data is already stored. As available memory becomes divided into smaller units through normal use, this leads to an increase in non-linear, or fragmented storage. The amount of fragmentation can reduce write speeds, so faster SD memory card speed standards help compensate for fragmentation.
The SD Association developed standards specifying various operating conditions for SDHC, SDXC, SDHC UHS and SDXC UHS memory cards to guarantee the minimum speed according to the card's speed class. Speed symbols are provided to help identify cards that comply with these standards.
data from www.sdcard.org
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While choosing a smartphone always think about storage it's very imp factor while thinking about smartphones, it no use of large high end smartphone if u dont have enough storage to download apps ,photos,songs,videos etc..
while thinking about SmartPhones storage it comes in two parts internal Storage and External Storage
it depends what kind of data we are storing on the card if we are using for regular data like songs photos low quality video for that Class 4 is sufficient if u are thinking recording high definition videos so u should have better Class SD card.
now what is Class of SD card
SD memory card manufacturers use different types of flash memory to create an SD memory card, so actual transfer speed can vary. Varying speeds make it difficult to determine which card will provide reliable recording of streaming content. Recording video require a constant minimum write speed to ensure a smooth playback. The SD Association defines Speed Class standards indicated by speed symbols to help consumers decide what card will provide the required minimum performance for reliability. There are two kinds of speed indications regarding SD bus generation:
Speed Class and UHS Speed Class* symbols indicate minimum writing performance to ensure smooth writing of streaming content such as video shooting. This is important mainly for camcorders, video recorders and other devices with video recording capabilities.
Speed Class designates minimum writing performance to record video. The Speed Classes defined by the SD Association are Class 2, 4, 6 and 10.
UHS Speed Class is designed for UHS** devices only and designates minimum writing performance to record video on UHS products. The UHS Speed Classes defined by the SD Association are UHS Speed Class 1 (U1) and UHS Speed Class 3 (U3).
* (Speed Class and the UHS Speed Class are not compatible.)
**UHS (Ultra High Speed), the fastest performance category available today, defines bus-interface speeds up to 312 Megabytes per second for greater device performance. It is available on SDXC and SDHC memory cards and devices.
| Marks | Operable Under | Applications | SD Memory Card | |
| Speed Class |  | High Speed Bus I/F | Full HD video recording HD still consecutive recording | SD, miniSD, microSD SDHC, miniSDHC, microSDHC SDXC, microSDXC |
  | Normal Bus I/F | HD ~ Full HD video recording | ||
 | SD video recording | |||
| UHS Speed Class |  | UHS-I Bus I/F UHS-II Bus I/F | Full higher potential of recording real-time broadcasts and capturing large-size HD videos (UHS Speed Class1 denotes a 10 MB/s minimum write speed) | SDHC UHS-I and UHS-II, SDXC UHS-I and UHS-II |
 | Capable of recording 4K2K video (UHS Speed Class 3 denotes 30 MB/s minimum write speed) |
SD Speed Compatibility
It’s important to remember that Speed Class and UHS Speed Class are two different speed indication symbols for different devices. However, a UHS-I memory card may also indicate a Speed Class.
The host device Speed Class requirements are minimum requirements for optimum performance. If your host device requires a Speed Class 4 SD memory card, you can use Speed Class 4, 6 or 10 SD memory cards. If your host device requires a Speed Class 6 SD memory card, you can use Speed Class 6 or 10 SD memory cards.
Fragmentation and Speed
The memory of a card is divided into minimum memory units. The device writes data onto memory units where no data is already stored. As available memory becomes divided into smaller units through normal use, this leads to an increase in non-linear, or fragmented storage. The amount of fragmentation can reduce write speeds, so faster SD memory card speed standards help compensate for fragmentation.
The SD Association developed standards specifying various operating conditions for SDHC, SDXC, SDHC UHS and SDXC UHS memory cards to guarantee the minimum speed according to the card's speed class. Speed symbols are provided to help identify cards that comply with these standards.
data from www.sdcard.org
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