SIM card removable required?
When replacing the battery, should I remove the SIM card?
Is this a good question?
Fifth generation of iPhone. Repair of this device is straightforward, and requires screwdrivers, prying tools, and patience. GSM/CDMA / 16, 32, or 64 GB / Black or White.
Removing the SIM card and/or SIM card tray is not necessary when replacing the battery on an iPhone 4 or 4S.
The battery is on the other side of the device from the SIM card, you only need to remove the back panel and disconnect the battery connector before actually replacing the battery.
You can find a guide here - iPhone 4S battery replacement guide
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