Firstly, it is possible to be influenced by one's dialect or sociolect.
The linguistic features of each sociolect are more or less clear-cut, but occasional interlectal seepages are not unusual - language is never in a freeze-frame.
If such a correlation is termed a "sociolect," then according to this argument, sociolects clarify aspects of social identity, insofar as the latter are reflected in speech.
Sociolinguists might also study the grammar, phonetics, vocabulary, and other aspects of this sociolect much as dialectologists would study the same for a regional dialect.
The current pronunciation varies greatly depending on the geographical dialect and sociolect (with, especially, stigmatized except at the beginning of a word).
Initially it served the role of a secret language, but in the late 19th century it became a standard sociolect of criminals.
The main cities each have their own modern urban dialect, that can be considered a sociolect.
Yet, the commonness varies from dialect to dialect and from sociolect to sociolectit depends on the formality etc. of the setting.
