Is a telecom broker free? How brokers actually get paid

Yes, working with a telecom broker or technology advisor is genuinely free for the client. The provider you choose pays the broker a commission out of their own sales budget, at the same price you would pay buying direct. You never receive an invoice from the broker.
Where the money actually comes from
Carriers and technology providers all maintain channel programs: they pay a commission to the advisor who brings them a customer, exactly as they would pay an internal salesperson. That commission does not get added to your bill, pricing is the same or better than direct, because an independent advisor makes providers compete for your business.
What to watch for
The model is only as honest as the advisor. Ask any broker two questions: do you show quotes from the whole market, and will you show me every option even when commissions differ? A genuinely vendor-agnostic advisor compares hundreds of providers and documents the comparison, so you can see the recommendation is driven by fit, not payout.
That transparency is the whole reason the model works: the advisor only wins when you buy something that actually fits, and keeps winning only if you stay happy with it.