barcode generator in vb.net 2010 5: Wi-Fi and 3G Connectivity in Objective-C

Encoder QR-Code in Objective-C 5: Wi-Fi and 3G Connectivity

CHAPTER 5: Wi-Fi and 3G Connectivity
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Type the Wi-Fi network Name, also known as the SSID Touch here to select Security: WEP, WPA, WPA2, WPA Enterprise or WPA2 Enterprise. Then type password below.
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Touch Other to set up a network that does not appear in the list above.
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Finally, click Join.
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Figure 5-1. You can manually enter the name of a Wi-Fi network, select the security type, and click Join.
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Type in the Wi-Fi network Name, touch the Security tab, and choose which type of security is being used on that network. If you are unsure, you ll need to find out from the network administrator. When you have the information you need, enter it along with the proper password and this new network will be saved to your network list for future access.
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Reconnecting to Previously Joined Wi-Fi Networks
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The nice thing about the iPhone is that when you return to an area with a Wi-Fi network you previously joined (whether it was an open or a secure, password-protected, network) your iPhone will automatically join the network without asking you again. However, you can turn off this automatic-joining feature, as described next.
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Ask to Join Networks Main Switch
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There is a main Ask to Join Networks switch, which is set to On by default. Known networks are joined automatically, this only takes effect if no known networks are available. With this switch set to On, you will be asked to join visible Wi-Fi networks. If networks are available that are not known to you, you will be asked before being connected.
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CHAPTER 5: Wi-Fi and 3G Connectivity
If the switch is set to Off, you will have to manually join unknown networks. Why might you want to turn off automatically joining a network This could be a good security measure if, for example, you don t want your kids to be able to join a wireless network on the iPhone without your knowledge.
Ask to Join and Ask to Login Switch on Each Network
Sometimes, you may find that a particular Wi-Fi network has additional switches that override the main Ask to Join Networks switch. Tap the little blue arrow next to the network name to see details about this Wi-Fi network. Auto-Join and AutoLogin are set to On by default. To disable Auto-Join or Auto-Login, tap each switch to set it to Off.
CHAPTER 5: Wi-Fi and 3G Connectivity
Forget (or Erase) a Network
If you find that you no longer want to connect to a network on your list, you can Forget it i.e., take it off your list of networks. 1. 2. Tap the Settings icon. Tap Wi-Fi to see your list of networks.
Tap the small blue arrow next to the network you want to forget in order to see the screen shown here. Tap Forget this Network at the top of the screen.
You will be prompted with a warning. Just touch Forget and the network will no longer show up on your list.
3G and 2G Cellular Data Connection
Your iPhone can also connect to the cellular data network the same network you connect to with other mobile phones. Here are things to consider about Cellular Data Connections: Wider availability than a Wi-Fi connection you can connect to 3G in a car or away from a city, whereas Wi-Fi is not typically available in these locations. Extra monthly service fees for access to the Cellular Data network In the US, AT&T charges about $15 for 200MB per month and about $25 for 2GB of monthly data.
CHAPTER 5: Wi-Fi and 3G Connectivity
NOTE: Check with your local wireless carrier for iPhone data plan pricing in your country.
Select and Monitor Your Cellular Data Usage
When you purchased your iPhone, you had to select a cellular data plan from your wireless carrier. For the iPhone in the US, this is currently AT&T. If you selected one plan and wish to try another plan, contact your carrier you may be allowed to switch data plans. TIP: Saving Money on Data Charges You might be able to save yourself some money with cellular data plan charges by doing the following: Always use Wi-Fi when possible. Start with the lower cost cellular data plan ($15 for 200MB). Monitor your cellular data usage throughout the month to make sure you are not going to exceed the lower cost data plan. You may find that you can live with the lower cost plan if you use Wi-Fi for most of your data needs. To check your current cellular data usage, look in your Settings icon. 1. 2. 3. 4. Tap the Settings icon. Tap General. Tap Usage. Swipe up to see the section below Cellular Data Network at the bottom. Your total data usage will be the sum of the Sent and Received. In the image shown here, the total data usage is approximately 346 MB (19.7 + 326 megabytes). If you want to clear out the statistics, tap the Reset Statistics button at the bottom of the screen.
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