Ertr,
Telecommunications is alot like most other industries in that we developed all sorts of models for various use cases across the industry. I myself was in the Credit and Collections group for a major carrier and we built logistic regressions, decision trees, and more for Probability of Involuntary Churn and linear regressions for Amount Past Due. We also modeled for which collections method would work best.
The Marketing department would build Voluntary Churn models all the time as well as Cross-sell/Up-sell models. They would also build recommendation engines for On-Demand video content as well as "Next Best Offer" models.
The Network engineers would use the Erlang and Gaussian distributions to model network traffic, but didn't really build any predictive models.
Finally, Operations would forecast network traffic, store foot traffic, customer churn, and sales monthly.
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