To understand what a sim card is, you first need to distinguish between two concepts: iPhone Lock and iPhone World.
Currently in the world market in general and the Vietnamese market in particular, the two popular iPhone versions are iPhone lock (network locked iPhone version) and iPhone world (international iPhone version).
What is a sim card?
Locked iPhones are distributed to consumers through mobile carriers (At&t, Tmobile US, Softbank Docomo...) and require the purchase of an international code or a sim card to be able to use all functions. Locked iPhones are sold at a much cheaper price than the market price , so they are chosen by consumers.
However, carriers require buyers to sign a mobile contract and only use that carrier. Users who want to use another mobile network or take their iPhone abroad must unlock it.
What is a sim card?
Sim ghép is a solution to unlock iPhone by using a flat microchip and installing it over the user's sim. Sim ghép is often used on locked iPhones (iPhones sold with a carrier contract, can only use sim cards from that carrier).
With this method, the device will mistakenly think that the SIM you are using is valid, from there the system will allow the iPhone to perform normal functions like an international iPhone, including making phone calls, sending messages, turning on 3G or 4G/LTE.
In addition, another way to unlock iPhone is to buy an international unlock code. After buying the unlock code, the locked iPhone will be activated as an international iPhone. Buying an iPhone unlock code is done by the iPhone distributors or unlock systems.
However, compared to buying a code to unlock an iPhone into an international version that costs from a few hundred to a few million VND, the solution of using a sim card for the iPhone is much cheaper. Therefore, the sim card is chosen and used by many users.
Sim card is a small chip attached to sim cards to unlock the network for locked iPhone models.
Advantages of sim card
When using a sim card, you can still use the original sim tray without having to replace it with another sim tray.
Cheap sim card price, easy to install and use.
Sim ghép also supports many locked networks in the world.
After installing the sim card and having signal, the device will work stably and have full functions like the international version.
Disadvantages of sim card
iPhones using a SIM card will not be as stable as international phones, sometimes losing signal or having weak signal. However, this situation rarely happens, if it does happen it is because the local mobile network is too weak.
In addition, your device will consume about 2% more battery than normal because it has to run the additional chip of the sim card.
In addition, iPhones running iOS using a sim card will have some errors such as Facetime, checking and recharging (*101#,*100#), message error +84...
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