The killing units were part of his Final Solution and dream of a pure Aryan European world controlled by him. He eliminated a lot of undesirables with his mobile killing units.
By "mobile killing units" I am assuming you are referring to the einsatzgruppen. They were disbanded because they were inefficient, expensive, and they had a difficult job that was having a negative effect on their morale.
Mobile gas chambers (enclosed vans) from December 1941 onwards. Fixed gas chamber from March 1942 onwards.
June 1941.
The gas vans were mobile gas chambers. They were developed from the T-4 programme.
They were called Einsatgruppen (or SD-Einsatgruppen). In English they are often referred to as mobile killing units.
Mainly in extermination camps, but some ordinary concentration camps also had small gas chambers (for example, Stutthof). In addition, in 1941 the Nazis also had some mobile gas chambers consisting of vans.
You can not have two devices having the same number, what you can do instead is transfer incoming calls to the landline to your mobile. In other words, when someone is calling your landline it will instead be redirected to your mobile device.
Mobile phones
They were the SD-Einsatzgruppen.
your mum :D
In the extermination camps the victims were gassed, then cremated. When killing 'in the field' the mobile killing units sometimes herded Jews into buildings which were then set on fire.