We all hand our phones over to friends when we want to share photos or videos. But what if your collection includes sensitive images you'd rather not show anyone else? Luckily, the iPhone makes it easy to hide your most personal pictures from view. Inside Photos, select one or more images, then tap the Share button and choose Hide. As the confirmation message says, your chosen pictures will become invisible via the Moments, Collections, and Years views, but can still be accessed through the Albums screen. In addition to letting you set alarms so you'll wake up on time, the latest version of iOS helps you keep to a given bedtime.
Open up the Clock app on your iPhone and then tap on the Bedtime link at the bottom to get started. First, your phone will ask you what time you want to wake up in the morning. When that's set, you can decide which days of the week you want the alarm to go off, and then how many hours of sleep you want each night. Your iPhone will then ping you when it's time to hit the hay, and track how well you're doing at reaching your sleep targets.
That's because the details you enter here, like your allergies and contact information for your next of kin, will appear on the lock screen when someone taps the dialer's Emergency link. In other words, anyone who picks up your device can access this information. So, if your phone gets lost, a helpful bystander can tap through to find a way to return it. Another, better-known way of locating a lost device is the Find My iPhone feature, which lets you track your phone on a map. Those of you who prefer a visual phone alert to an audible one will like this: You can get your iPhone's flash to light up when a notification is displayed.
This could come in handy during meetings, when many people place their phones face-down on top of a table. To get the feature working, go into Settings and then tap General and Accessibility. If you prefer to not be disturbed at all when the phone is in silent mode, you can tell the flash not to light up then. Siri is pretty adept at working out who you want to text or call. But you can speed up the process by adding nicknames like "mom" or "Lizzie" to your contacts.
In fact, Apple's Contacts app has a field especially for this, and Siri can use it to identify people. To input a nickname manually, open up any contact card, tap Edit, choose Add field, and then pick Nickname from the list.
Alternatively, just tell Siri to "call mom" or "call dad" or something similar. Then the assistant will ask you which contact that nickname belongs to—remember your answer for future use. Sometimes, an email attachment just doesn't convey enough information on its own. So annotate it with the Mail client built into iOS. Digital scribbles, text overlays, a zoom-in magnification window, digital signatures—you can add all of these on top of email attachments.
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To modify an attachment you've received you can still review your email before sending it , tap and hold it until the Share menu appears. Then pick Markup and Reply from the list. For a file you've attached to a new email, tap the attachment and choose Markup. The ability to zoom in on real-world images might prove helpful in all kinds of situations, such as when you're squinting at a menu in a dimly-lit restaurant. To use it, go to Settings, open General, choose Accessibility, and then tap Magnifier and turn the feature on.
GSM localization uses multilateration to determine the location of GSM mobile phones, or dedicated trackers, usually with the intent to locate the user. The location of a mobile phone can be determined using the service provider's network infrastructure.
The advantage of network-based techniques, from a service provider's point of view, is that they can be implemented non-intrusively without affecting handsets. Network-based techniques were developed many years prior to the widespread availability of GPS on handsets. The accuracy of network-based techniques varies, with cell identification as the least accurate and triangulation as moderately accurate, and newer "advanced forward link trilateration " timing methods as the most accurate.
The accuracy of network-based techniques is both dependent on the concentration of cell base stations, with urban environments achieving the highest possible accuracy because of the higher number of cell towers , and the implementation of the most current timing methods.
One of the key challenges of network-based techniques is the requirement to work closely with the service provider, as it entails the installation of hardware and software within the operator's infrastructure. Frequently the compulsion associated with a legislative framework, such as Enhanced , is required before a service provider will deploy a solution.
The location of a mobile phone can be determined using client software installed on the handset. In addition, if the handset is also equipped with GPS then significantly more precise location information can be then sent from the handset to the carrier.
Another approach is to use a fingerprinting-based technique,    where the "signature" of the home and neighboring cells signal strengths at different points in the area of interest is recorded by war-driving and matched in real-time to determine the handset location. This is usually performed independent from the carrier. The key disadvantage of handset-based techniques, from service provider's point of view, is the necessity of installing software on the handset.
It requires the active cooperation of the mobile subscriber as well as software that must be able to handle the different operating systems of the handsets. One proposed work-around is the installation of embedded hardware or software on the handset by the manufacturers, e. This avenue has not made significant headway, due to the difficulty of convincing different manufacturers to cooperate on a common mechanism and to address the cost issue. Another difficulty would be to address the issue of foreign handsets that are roaming in the network.
The type of information obtained via the SIM can differ from that which is available from the handset. For example, it may not be possible to obtain any raw measurements from the handset directly, yet still obtain measurements via the SIM. Crowdsourced Wi-Fi data can also be used to identify a handset's location. Hybrid positioning systems use a combination of network-based and handset-based technologies for location determination. Both types of data are thus used by the telephone to make the location more accurate i.
Alternatively tracking with both systems can also occur by having the phone attain its GPS-location directly from the satellites , and then having the information sent via the network to the person that is trying to locate the telephone. In order to route calls to a phone, the cell towers listen for a signal sent from the phone and negotiate which tower is best able to communicate with the phone. As the phone changes location, the antenna towers monitor the signal, and the phone is "roamed" to an adjacent tower as appropriate.
By comparing the relative signal strength from multiple antenna towers, a general location of a phone can be roughly determined. Other means make use of the antenna pattern, which supports angular determination and phase discrimination. Newer phones may also allow the tracking of the phone even when turned on and not active in a telephone call.
This results from the roaming procedures that perform hand-over of the phone from one base station to another. A phone's location can be uploaded to a common website where one's friends and family can view one's last reported position. Newer phones may have built-in GPS receivers which could be used in a similar fashion, but with much higher accuracy.
This is controversial, because data on a common website means people who are not "friends and family" may be able to view the information. Locating or positioning touches upon delicate privacy issues, since it enables someone to check where a person is without the person's consent. In Malte Spitz held a TED talk  on the issue of mobile phone privacy in which he showcased his own stored data that he received from Deutsche Telekom after suing the company.
He described the data, which consists of 35, lines of data collected during the span of Germany 's data retention at the time, saying, "This is six months of my life [ Spitz concluded that technology consumers are the key to challenging privacy norms in today's society who "have to fight for self determination in the digital age. China has proposed using this technology to track commuting patterns of Beijing city residents. In Europe most countries have a constitutional guarantee on the secrecy of correspondence , and location data obtained from mobile phone networks is usually given the same protection as the communication itself.