Each figure is said separately.
24 - two four
The figure 'O' is called oh.
105 - one oh five
Pause after groups of 3 or 4 figures (last group).
376 4705 - three seven six, four seven oh five
If two successive figures are the same, in British English you would usually use the word double (in American English you would just say the figure twice)
376 4775 - BE: three seven six, four double seven five376 4775 - AE: three seven six, four seven seven five