What is a Sim Network Unlock Pin?
A“Sim Network Unlock Pin (NUP)” or“Network Unlock Code (NUC)” will remove the carrier lock built into GSM mobile phones by services providers to restrict the use of these phones to specific countries and/or networks. These are usually referred to as "Network (NCK)" or "Service Provider (SPCK)" locks and can be removed using the corresponding unlock codes, which are unique to each phone depending on its IMEI.Typically, a locked handset will display a message if a restricted SIM is used, requesting the unlock code. On recent phone models running Android software, the phone will display a message saying “SIM network unlock PIN” or “Enter Network Lock Control Key” if network locked. Windows phones will display the message, “This SIM card can only be used on specific networks".Unlocking the phone is universally legal so there are more reliable services like https://www.unlockradar.com, that will unlock your cell phone so you can use it with other carriers.The unlock code is verified by the handset and is generated by the manufacturer, typically using an algorithm such as a one way hash or trapdoor function. Sometimes big telecom providers change the original factory unlock codes as an extra layer of security against unlocking services. For various big brands such as Samsung and Motorola there is no algorithm but just a random code generator where the unlock codes are programmed in the phone itself and then saved in a big database managed by the manufacturer. The unlock companies like Unlockradar have access to these databases and that is how they can deliver unlock codes to their customers.
Is there any way to get free SIM network unlock codes?
You can get free unlock code only from your service provider. You just have to contact their customer support and ask them to provide the code. To get the unlock code from your service provider you must have to fulfill their terms of unlocking and your contract period should be expired.Also there are few site offering free unlock codes but most of them are scam or there is some trick. If you are not able to get the unlock code from your carrier you can try any reliable unlocking site to get the unlock code.One of the trusted site i can recommend is Codes2unlock.com because i had used them many times without any issue. They also have money back guarantee if the code is not working.
Can a phone work without a SIM card? Why or why not?
Well...Let's go with a YES....a phone, that is: the device today known as a smartphone, which employs -in some occassions- a SIM card- can work without a SIM, providing that :If you want to use that device as a phone, cellular phone, then NO, it won't work. It requires the SIM card to be able to "enable" so to say, the actual phone number and then connect and identify itself to a cellular network and ultimately place and receive cellular phone calls.Now, it you want to use that very same device with or without a SIM card for:WiFi based Internet purposes (navigation, downloading pictures, movies, music)...Music listening.Movie / video watching.Pictures taking with the camera.Any internet based communications (hangouts, skype, etc. -WhatsApp may depend on having had, at least once, an operational SIM card tough-)Then your phone WILL perfectly work fine, as all this activities, (except perhaps for WhatsApp activation), do not require, nor depend on a SIM card and the functionality this SIM provides.
I just put my old SIM card in my new iPhone and it works fine, but AT&T is telling me that I need to use the new one that came with the new iPhone, why?
I believe that your IPhone 5 works well on 3 G networks and your new IPhone 6 works best on 4 G networks.So the old SIM card may work fine in the new phone but is unable to communicate or detect WiFi or to activate Bluetooth .Do you use these functions or services? WiFi is very useful to you when you need to access the internet. Some places provide free access to the internet, mainly in Malls, or food and beverage providers.The new SIM card that came with the new phone, has been configured, such that you will be able to utilize the full functions of your phone. Your phone number is attached to your new phone through the New SIM card. You can Google IPhone 6 for details of the phone.So, do worry about charges or the government spying on you, unless you are a Person of Interest, being seek by the CIA, FBI, NSA or the Homeland Security.Phone charges were agreed by yourself when you sign up or when you bought the IPhone 6.That being said, charges incurred by your usage of your IPhone for downloading of data or making Long Distance calls are chargeable by the Service provider or phone companies.Hope the above explanation has been useful to you.
What is the purpose of a SIM card? What information does it hold? I was told it contained internet history, contacts, etc. Is this correct?
SIM - Subscriber identification module is basically a Chip which contains Some information to handshake Mobile Device with Telecom OperatorSIM Doesn’t Not hold your Call Log information, Internet Browsing History, Call Duration.What information is STORED in SIM(SIM) is an integrated circuit chip that is intended to securely store the1. International mobile subscriber identity (IMSI) number. This Changes you do MNP2. Mobile number (MS-ISDN). Remains same if you Do MNP3. Authentication key, which are used to identify and authenticate subscribers4. It is also possible to store contacts on many SIM cards. such as contact list data and SMS messages. Most SIM cards have a capacity between 32 to 256 KB.5. SIM cards are always used on GSM phones(2G/3G) and 4G (USIM)6. SIM also contains Temporary information related to the local network ( in in the form of LAI), a list of the services the user has access to, and two passwords: a personal identification number (PIN) for ordinary use, and a personal unblocking code (PUK) for PIN unlocking.7. SIM card also conatains SMSC Center informations which burnt by Telecom Operator before it is Handed over to you.LAI : When the Subscriber Changes locations, it stores the new LAI to the SIM and sends it back to the operator network with its new location. If the device is power cycled, it will take data off the SIM, and search for the prior LAI.Type of SIMSIM cards have been made smaller over the years; functionality is independent of format.Full-size SIM were followed by mini-SIMmicro-SIM,nano-SIM.SIM cards are also made to be embedded in devices.SIMs for Machine2 Machine applications are available in a surface mount SON-8 package which may be soldered directly onto a circuit board. In future you Devices will be contacting each other due this e.gYour Refrigerator will Inform Shopping Mall That Vegetable are required in refrigeratorPlants will information Water Resovior that it needs water supplyYour home Solor plant will inform city Electrical board that you have surplus electricity to sell /charity.SIM Chip Information
Why does a smartwatch need a sim card?
Most smartwatches do not use a sim card. In general smartwatches act as a accessory of a specific phone, they connect to _that_ phone over Bluetooth or WiFi. They serve as notification aid for incoming information and can also provide fitness relates parameters back to the phone. Most smart phones can also be used as a speaker/microphone for making calls over Bluetooth.There are both high-end and cheap smartwatches that can work with their own mobile subscription with a (e)SIM. Advantage is that you don't need to phone anymore for connectivity but in real life it's usability is limited. It seems cool to be able to make calls from your wrist when you don't have your phone anymore but for this you need an additional number and subscription. Carriers might want to sponsor the device and give you a rebate. In general you would only use this when you're serious about running where the phone would be too bulky. Here it might serve as an emergency phone.The only advantage I found with a Samsung connected watch that I could leave my phone in my jacket when I went for a coffee break, Bluetooth would not have made it, nor WiFi and the 3G coverage ensured delivery of messages. For this I need to pay a monthly fee and deal with a bulkier device that drains the battery quiet fast. In practice, you would need to setup a deviation on your phone that would call the smart watch phone before going to voicemail. Some carriers might allow things like ‘'parallel call’ but picking up your call in the cafeteria with speaker phone might not be the best idea depending on the nature / sensitivity of the call. Yes, you can pair a local Bluetooth headset to the watch to make calls discreetly but it’s a hassle.