CWW and IBEW are engaged in a legal strike per NLRB.
VZ using existing / pre-trike non-Union employees to cover strikers' work is legal. These employees are not scabs, defined as workers hired specifically to replace strikers.
Verizon cannot, by law, terminate striking workers in a legal strike.
Those employees performing strike duty are vacating their normal role, creating productivity gaps elsewhere in the organization. They are neither committed to or competent in the temporary role they've been assigned. Quality of work and productivity suffers in the back-filled striker role, the vacated Non-Union role, and across organizational processes.
Union demands, if achieved, benefit all VZ workers either directly (as a participating Union employee) or indirectly (through benefit parity, base lining, etc).
Those posting who write that the strikers are overpaid, whiners, don't know how good they've got it, are disposable, etc are simply tools. Tools of VZ Mgt. The Union membership voted to strike, has good reasons to strike and strike now, and if they can stay united as well as have sympathizers (other unionized groups such as AFL-CIO, other trades, restaurant workers, etc) not cross lines, could be successful quickly.