How to Insert a SIM Card in OPPO F21 Pro 4G

A SIM card is a small plastic card with a microchip, which is purchased from the telecom operator. It is needed to access the communication services of the OPPO F21 Pro 4G smartphone. After buying it, you need to insert the SIM card in OPPO F21 Pro 4G.

Inserting a SIM card if the battery is removable

Installation of a SIM card for smartphones with a removable and non-removable battery is different. If the back cover of a smartphone can be disconnected from its body, follow these steps:

Turn off the smartphone.
Remove the back cover.
Insert the SIM card into the slot.
if, having removed the cover, you cannot see the SIM card slot, then most likely it is located under the battery. Remove the battery.

After installing the SIM card, you need to perform this sequence of steps in reverse order. Thereafter, the phone can be turned on again.

Inserting a SIM card if the battery is non-removable

Modern smartphones based on the Android operating system usually have a non-removable battery. In this case, the SIM card is installed without disassembling the smartphone:

Take a special key that usually comes with a smartphone to eject the SIM card tray. If you do not have a special key, use a use a bent paper clip.
Insert the key into a small hole located on the edge of the OPPO F21 Pro 4G.
Put the SIM card in the tray.
Put the SIM card tray into your smartphone.

As in the previous case, you need to turn off the device before inserting a SIM card into OPPO F21 Pro 4G.

SIM card trays can be single, double, combined and full. The first two types are designed for one or two SIM cards. The remaining two types allow you to additionally install a memory card. In the case of a combined tray, the installed microSD card replaces one of the SIM cards.

What to do if the SIM card does not fit the tray

During the installation of the SIM card, you may encounter that the card does not fit the size of the slot. A similar situation often occurs during the setup of a new smartphone.

There are several SIM card standards:

Standard SIM. An outdated type of SIM card that has a large size. Used in older phones and smartphones.
Micro SIM. A relatively new standard that replaced Standard SIM. SIM Card has become a little smaller.
Nano SIM. The current standard of SIM cards, in which its size is almost completely equal to the size of the microchip installed on it.

There is a SIM card adapter if the size of your SIM card does not fit the device. It comes with all new SIM cards. If you do not have one, contact your telecom operator for a free SIM card replacement.

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