Review: Apple iphone 3G
The iPhone 3G is Apple’s most recent innovation in the three g phones class. At first glance, it may look like a exact replica of the original iPhone. It’s without question that the differences between the phones are physically hard to see, but there are a few subtle external differences and more than a few significant internal differences customers should take notice of.
The iPhone 3G is available in two colors, black and white. The black version comes in two distinct sizes, 8 GB and 16 GB. The white version is only available in the 16 GB capacity. It isn’t made out of aluminum, like its predecessors, but rather made up of a glossy plastic. Personally I don’t like this change, but I understand why it was necessary considering the wireless capability it has within it.
Not a lot has changed with the 3.5 inch touchscreen, but this is a sign of the beauty in its original design. The touchscreen is as responsive, if not more so, as it was in previous models. Plus the touchscreen is as bright and beautiful as ever. Apple decided to not include a dock with th is model. This is horrible when you take into consideration the old dock,from previous models, is not compatible with the 3G. On the other hand, the virtual keyboard remains completely unchanged.
As an improvement, the iPhone 3G doesn’t have a recessed headphone jack. This feature was removed because of feedback received from users, since the original release. Another great improvement regarding audio capabilities is the fact that the speakers are now a few decibels louder then they were in previous models.
Underneath the plastic exterior, it’s really impressive. The iPhone 3G zips through data transfers and Web browsing, and has been observed downloading at speeds in excess of 800 KB per second. Being a AGPS device, This model really excels in it’s performance during positioning acquisition. In that area, this phone shows it’s superiority over other 3G phones.
The iPhone does have a some flaws though. It still does not have a user replaceable battery and still lacks a slot for users to expand its memory. But these flaws pale in comparison to the overall benefits you get for owning one.
Apple still appeared to be the leader in the market in regards to the smartphones, but the competition is starting to catch up. If you want the greatest 3G phone currently on the market, the iPhone 3G would be for you.
Tags: 3g phones, Apple, iphone, smartphone, smartphones, Three G PhonesRelated posts
Three G Phones And Bluetooth
Bluetooth is a high speed, low powered wireless link technology that’s designed to connect to three g phones or other portable equipment together with little to no work required by the user. Unlike infrared, Bluetooth doesn’t require line of site positioning to work.
Current prototype circuits are contained on a board that is 0.9 cm square, with a much smaller circuit board being developed.
When one Bluetooth device comes in contact with another, they will automatically exchange addresses and details of capability. Then, they can establish a 1 MB link with security that they will use as required. The protocols involved with handle both data and voice, with a very flexible topography.
The technology achieves its goal by embedding tiny, non expensive short range tranceivers into the devices available today. The radio operates on the 2.45 GHz frequency band, and supports up to 721 KBps, along with three voice channels.
Each devices offers a unique 48 bit address from the IEEE 802 standard, with the connections being point to point or multipoint. The max range is 10 meters, although it can be extended to 100 meters by increasing the power. The devices are also protected from radio interference by changing
their frequencies, also known as frequency hopping.
What’s important, is the fact that Bluetooth devices won’t drain battery life. The specification targets power consumption of the device, limiting the drain on the battery. The radio chip will consume only 0.3mA in stand by mode, which is less than 5% of the power that standard phones use.
Bluetooth will also guarantee security at the bit level. The authentification is controlled by the user via a 128 bit key. The radio signals can be coded with anything up to 128 bit. With the frequency hopping, Bluetooth is already very hard to listen into.
The baseband protocol is a combination of both circuit and packet switches. Slots can be reserved for synchronous packets as well. Each packet will be transmitted in a different hop frequency. Normally, a packet covers a single slot although it can be extended to cover up to five slots.
Bluetooth can also support data channels of up to three simultaneous voice channels. Therefore, it’s possible to transfer the data while you talk at the same time. Each individual voice channel
will support 64 KB.
From a technical standpoint, Bluetooth is very different indeed. It’s the best wireless method in the world, surpassing even infrared. For communication on the go, Bluetooth is indeed very hard to compete with.
Tags: baseband protocol, Bluetooth, bluetooth device, bluetooth devices, Three G Phones, wireless link technology