And some operators let subscribers create groups of friends but only within the same carrier network.
Financial advisers have said that some operators in their industry have given it a bad name.
This encourages misleading and unauthorized disclosures from others, including from some operators themselves, leading to more sensationalism.
But new software that identifies fraudulent callers on mobile networks is helping some operators slash their losses.
Some operators like Devon Energy have sold out of their deepwater prospects entirely, citing the huge costs involved.
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Some operators, such as Telefonica owner of the UK's O2, are mulling whether to provide compensation for affected users.
As a result, some operators say they have reduced the number of passengers on their boats, taking a toll on revenues.
In the last two years, the IRS has launched investigations of hundreds of promoters and shut some operators with court injunctions.
Rail services have also been affected with some operators running altered timetables.
Some operators including Bharti recently increased their telephone-call charges for the first time in several years and cut down discounts to offset rising costs.
The apps allow users to communicate without using their voice or text allotments, leading some operators like KPN to complain about the hit to their bottom line.
Across the region, there is a growing suspicion that in the rush to cash in on Southeast Asia's health-care boom, some operators are less than scrupulous about maintaining medical standards.
And, in case of some operators such as Verizon, this will hit the consumers when they start moving from 3G to 4G LTE data or when they try to upgrade their phones.
For example, some tour operators and villa companies are offering four nights for the price of three while Aegean Airlines has some keen offers for domestic flights.
Some machine operators will become machine minders, which often calls for a broader range of skills.
Also, some US operators, such as Verizon, unlock all phones of a particular type they sell.
Some machine operators will raise prices and offer 25-cent discounts for cash starting in January, he says.
He also said that some pipeline operators expressed concern that that the technologies might interfere with operational safety.
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Some train operators were running revised services and drivers have been advised to allow extra time for journeys.
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The cost of docking in Colombo had become so high that some shipping operators plan to bypass the port.
Some local operators already cite examples of difficulties they have in obtaining roaming agreements with the two big carriers.
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In my view four is probably too little and I think there is always a role for some niche operators.
National organiser for Aslef, Simon Weller, said London Midland and some other operators had become "effectively a kindergarten" for drivers.
But some tour operators said travel to Cuba has become more cumbersome and expensive but is not policed any better.
This reflects the phenomenon that has surprised some European operators in 2011.
So far, some 35 operators are participating in the project, and services based on the framework are expected by the second quarter of next year.
That threat has prompted some telecom operators including Telefonica to launch their own rival services, while others such as India's Reliance Communications have preferred to sign formal partnerships with WhatsApp itself.
Some mobile operators that are running both Wi-Fi networks and 3G networks say the cost of building more capacity in the Wi-Fi network is only 10% of the cost to do so in the 3G network.
But there is still a chance that the impact of digital conversion may be weakened: Some cable operators are arguing that they should be able to keep supplying their customers with analog signals which would allow them to keep watching without an upgrade.
Some power operators fear, however, that that they will get sued if they equip their facilities so that they could capture excess heat, which could alter the generation process and thus violate the New Source Review, writes Melissa Mullarkey, for Recycled Energy Development.
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