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A physical SIM can be transferred from a broken to a working phone. [34] The eSIM, which allows communications to be made and charged to the account-holder, cannot be removed if having the phone repaired, or lending it to someone. eSIM accounts must be deleted or transferred from a phone when it is sold or disposed.
For a classic example for understanding the fundamental difference of TDMA and CDMA, imagine a cocktail party where couples are talking to each other in a single room. The room represents the available bandwidth: TDMA: A speaker takes turns talking to a listener. The speaker talks for a short time and then stops to let another couple talk.
A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).
It is possible to calculate the real signal strength measured in dBm (and thereby power in Watts) by a formula. However, there are different formulas for 2G, 3G and 4G networks. In GSM networks, ASU maps to RSSI (received signal strength indicator, see TS 27.007 [ 3 ] sub clause 8.5).
The language that is used to describe these specification is a little confusing since eSIM is not a physical format (or "form factor" - the phrase that is used to describe the various SIM sizes). The eSIM describes the functionality in the SIM, not the physical size of the SIM - and there are eSIMs in many formats (2FF, 3FF, 4FF, MFF).
speed* Typical download speed* Theoretical maximum upload speed* Typical upload speed* Frequency band Channel spacing Maximum range (distance from antenna) Year of commercial implementation 0G SN, SN+ 2B/s: 50-150MHz: 1946 0.5G SI 200-350MHz: 1958 analog & digital ↓ 1G NMT, AMPS, TACS… 400-450MHz: 1979 1.5G D-AMPS 30kHz: digital ↓ 2G GSM ...
IMSIs can sometimes be mistaken for the ICCID , which is the identifier for the physical SIM card itself (or now the virtual SIM card if it is an eSIM). The IMSI lives as part of the profile (or one of several profiles if the SIM and operator support multi-IMSI SIMs) on the SIM/ICCID.
Notes: All speeds are theoretical maximums and will vary by a number of factors, including the use of external antennas, distance from the tower and the ground speed (e.g. communications on a train may be poorer than when standing still). Usually the bandwidth is shared between several terminals.