Unlimited Plan Impact

So far, it doesn't seem that new unlimited use plans offered by all the major providers have had any particular impact on revenues. In fact, at&t executives claim that the new plan is revenue neutral. In other words, as many people are upgrading to the new plans as are downgrading from plans where they paid more.

What does seem likely is that more users will be exposed to what they can do when they have data services beyond texting. To the extent there is an ultimate change in revenue, it will be found in increased sales of data products of various types.

Verizon earlier had noted that just 305,000 of its subscribers--0.5% of its sub base--had wireless calling plans priced at more than $99.99 per month, at the time it launched its unlimited calling plan.

Those customers spent an average of $125 to $135 per month on phone calls. So even if every one of those customers dropped down to $99 a month plans, Verizon would be looking at just $7.6 million to $10.7 million in lost revenue per month.

And that would be balanced by increased revenue from customers upgrading to the new plan.