What is a sim card? Advantages and disadvantages and how to use sim cards properly

Sim graft is a small chip used to be inserted with the sim card to unlock iPhones that have been locked by the carrier (iPhone Lock). What are the advantages and disadvantages of this sim? How should the sim card be used on your iPhone?

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What is a sim card?

Sim graft is a small chip attached to sim cards, to unlock the network for iPhone Lock models .

Sim grafts are usually in the form of a small piece of copper, flattened like a sheet of paper and placed in the sim tray, inserted on top of the sim the user is using.

The iPhone Lock device, after being fitted with a paired sim, will immediately receive the signal and use it in Vietnam normally with the carrier and the phone number kept the same .

Pros and cons of grafted sims

Advantage

• Use the original sim tray, not replace another sim tray.
• Low cost, easy to install and use.
• Support many lock network operators in the world.
• Once there is a signal, use it as stable and fully functional as an international copy machine.

Defect

• iPhone using sim-coupled waves will not be as stable as international ones, sometimes there is a phenomenon of loss of signal, weak signal, this situation rarely happens, if any, because the regional mobile network is too weak.
• iPhone Lock will consume about 2% more battery than usual because it has to run more chips of the sim card.
• In addition, iPhone running iOS using a paired sim will have some errors such as Facetime, check and recharge (*101#,*100#), error message +84…

Use sim card properly

How to install sim card

Step 1: Check which carrier the device belongs to. JPAu, JPSoftBank or DoCoMo.

Step 2: Insert sim card and nano sim into sim tray.

Remove the sim tray, put the sim card in first, so that the side with the electronic circuit is facing up and the angles when inserted into the sim tray must coincide.

Next, insert a Nano sim on top of the sim card, the side with the electronic circuit is turned up and the angles of the sim card when inserted into the sim tray must coincide.

Step 3: Insert the SIM tray back into the device.

Step 4: Choose a carrier

After inserting the sim tray into the device, a table of carriers will be displayed to choose from. Then you need to choose the correct carrier name on iPhone Lock (checked in step 1). Then choose accept.

Step 5 : Restart the device, can use the device with normal sim card.

How to activate paired sim

Step 1 : Remove the sim card and turn off the phone. Then turn on the power again and wait for a while for the device to start up and then insert the sim back in.

Step 2 : Wait until the word Welcome appears, then press the ACCEPT key, then the screen will display No Service (Service is not available).

Step 3 : Wait for about 10 seconds until the device displays the wave column (Only iOS 5.0 indicates “No Service”), then select Phone. Puppet pressed the call key 112 and hung up immediately after 3 seconds.

Step 4 : Open Settings to turn on airplane mode.

Step 5 : When the iPhone device displays the “No Simcard installed” table, press the OK key.

Next, choose to turn off airplane mode. When airplane mode is turned off, the device will report the error “SIM Failure”. Leave the error message as it is, about 10 seconds later, the error message will disappear and the carrier signal will appear.

Above are the general concepts and how to use sim grafts that lassho.edu.vn wants to inform readers. Hope the article is useful to you!