Now we are not using lendline so disconnected our lendline
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Answer:
Do landline telephones still have use in a wireless world, or should they be disconnected?
Yes, landline, or as they are usually called, Plain Old Telephone System (POTS) based telephones continue to play an important role in telecommunications for our present world.
These century-plus-old technology based telephones provide something no more modern telecommunications system can provide: penultimate reliability.
In the world of voice telecommunications the POTS copper twisted pair wire based telephone system provides what is called “Five Nines” reliability, which means a voice telephone call will both have a dial tone and will connect to a switchboard 99.999 percent of the time the telephone receiver/handset is picked up and placed against a human ear. Thus, the term “Five Nines” - 99.999% voice call reliability. This equates to roughly a maximum of five (5) minutes “down” time for a copper twisted wire technology based telephone system per year of 24-hour seven-days-a-week (“24/7”) operation.
No present competing voice telecommunications network technology meets the “Five Nines” reliability criteria. Not CATV’s VoIP, not SATCOM based telephone (think: Iridium), not any form of “Land Radio”, not 3GPP cellular in any form prior to fully implemented and NR compliant 5G (2G, 3G, 4G, LTE, LTE-A, LTE-U).
The reason is at least two-fold: (1) electrical power and (2) two-way channel connectivity.
My personal experience includes having experienced the 2021 Polar Vertex that is still causing civilized society reversal throughout Texas where I reside. For days and up to a week or more millions of Texans were without reliable electricity. By definition if any of these millions of people relied entirely on the two-way voice telecommunications systems I listed above they also endured this time without reliable voice telecommunications with the world outside their residence. Any subscriber connected to a POTS network very likely never lost voice telecommunications during any part of the 2021 Polar Vortex weather disaster.
My personal experience also includes being the primary caregiver for my terminally ill Spouse for many years up until December 25, 2017. During the last five and half years of my Spouse’s life I elected to subscribe to both a landline telephone service and a 3GPP 3G/4G cellular telecommunications service in order to ensure I had the best possible chance to complete emergency telephone calls when necessary.
hope it's helpful.