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I think you meant to type "LTE/3G/2G".

LTE is one form of 4G. It stands for "Long Term Evolution". There are various other flavours, but all brands of network should support LTE.

If a connection can't be made to LTE, the phone will try 3G, and then 2G.

Surprisingly, 2G will still be around when 3G is killed off. There are some essential services which rely on it.

The Registry is a database containing many thousands of settings used by Windows and applications. Windows 95 was the first time consumers saw its use.

There are MANY products which claim that tidying up old or "broken" registry entries is a Good Thing, and will speed up your computer.

They are lying.

They don't know which registry entries are needed by which programs, so may do more harm than good.

Removing those entries which are ACTUALLY unused will speed up your computer in the same way as throwing away the cardboard box in the far corner of your attic will speed up your journey from your front door to your kitchen.

So don't waste time on these things, and certainly don't waste your money.

Incidentally, the various files which comprise the Registry are known as "Hives", just to annoy someone in the development team who had a fear of bees.

7.3 Paddington (Agatha Christie, 4:50 from Paddington)

7.5 Waterloo (The Importance of Being Earnest)

14.2 Surely that refers to Roget's Thesaurus?
14.5 Studebaker
14.7 Carlo Abarth in 1933. Abarth these days are the makers of fast Fiat cars.

16.3 Pieter Bruegel the Elder, (Winter Landscape with Ice-skaters and Bird-trap, 1565)

12.2 Algeria - The Italian Girl in Algiers (L'Italiana in Algeri)

18.8  The cutting down of the Sycamore Gap tree, which featured in "Robin Hood Prince of Thieves".

Is Malin Head, the northernmost tip of Ireland, named after someone with the surname, or is it an anglicisation of something Gaelic?