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447. What are the types of SIM ?

There are basically 3 types of SIMs:

Non-programable - cannot be programmed and must be replaced with a new SIM if changing SIM info.

Programable - integrated into the phone, can be reprogrammed, i.e., does not have to be replaced if changing info (also referred to as embedded).

Soft SIM - an application, not a separate piece of hardware, in the phone, it can be programmed.
Soft SIMs are not really deployed yet ,because of security concerns.
 
438. Why can't we see light emitted from TV remote while a camera can?

The human eye can only detect wavelengths up to about 725 nm efficiently, so we don't see the beam from the IR remote.
Cameras, on the other hand, typically are made with silicon sensors, naturally sensitive to wavelengths up to about 1100 nm, which gives a photon energy just slightly below the silicon band gap energy. Therefore the camera sensor does see beams from typical IR remotes.
 
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