Difference between 32K and 64K SIM Cards

Subscriber Identity Module or SIM cards were commercially available in 1991 by a company called Giesecke & Devrient. They are used to store personal information and details of a subscriber, that are used to connect to the service. The SIM Card can be transferred to different devices as long as the device supports the specific Subscriber Identity Module card. They are available in various formats such as 32K, 64K, 128K and 256K.

The ‘K’ represents the kilobyte of memory available in the particular SIM card for storage. As the numbers increase, the memory space has also increased and better internet connectivity technology is adapted. The latest versions such as the 128K and 256K have additional functionality of tracking the mobile phones when lost. The earlier versions such as 32K and 64K had very less storage space and could store very few messages on the card.

Difference between 32K and 64K SIM Cards :

S.No.	32K	64K
1.	It was popular during the 1990s.	It was available after 2001.
2.	It is not used much in today’s world as it has become outdated.	It is used in present times.
3.	It can be used to store the contact information of lesser people of about 250.	It can be used to store the contact information of more people of about 500 (approximate value, as it depends upon the provider).
4.	It is used for accessing 2G data services.	It is used for accessing 2G and 3G versions of data services.
5.	It cannot be used for tracking phone in case of theft or loss.	It can be used to track the phone in case of theft or loss.
6.	The network operators can run few mobile network operations on it because it has very less storage compared to 64K SIM cards.	The network operators can run more mobile network operations on it because it has more storage.
7.	It has 32 Kilobytes of storage space.	It has 64 Kilobytes of storage space.
8.	It does not have SMS lock, auto roaming and direct access to social network accounts.	It has SMS lock, auto roaming and direct access to social network accounts.