Speaking as something with the editors on his cell phone was faced with an unusual phenomenon - every half-hour stable relationship ended abruptly, though the display was 5 "sticks" indicator. Operator, MegaFon-Moscow fare - Group Reception (unlimited incoming of any kind). Ponder this situation, the version of network problems I rejected immediately, as, indeed, a bad connection - 8 floor building in central Moscow near the big window (on the map - a stable reception is guaranteed). Deciding to check what's the deal I made inquiries and found an interesting picture - it turns out, is pre-programmed feature of any network that runs on any and all types of phone calls. But first things first. 
However, to clarify the situation completely, we asked the experts and representatives of telecommunications equipment manufacturers. It turns out that termination of the call is done to protect subscribers from "hung" calls and the need to pay for them. From a technological point of view of the equipment is no limited - call termination may be made through any period of time, but the standard in the world practice setting is precisely the gap of 30 minutes (plus or minus 5 minutes, at the option of the operator). The problem is freezing of calls is largely due to the fact that signaling networks in many countries (including - in Russian communication networks) are not always correctly transmits the completion of the call, such as fixed phones - the call is considered incomplete until until the handset will not disconnect caller, even if the caller is already disabled, so the function was introduced forced interruption. As noted by one of our expert, who asked to remain anonymous, this option forced the completion of a call was from the time when the "mobile devices cost thousands of dollars and their main buyers were the guys in red jackets with shaved nape.Cost per minute was high and if the monthly invoice billing problems were detected, the cellular companies could come to a "purely concrete guys" with a "bazaar" of where the money. "Now the situation with the users of cellular phones has changed, but despite the fact that the probability of this "lag" is very low, operating companies still set the function interrupt long-term or "hung" conversation. According to some experts, such a threshold is forced opening set based on the number of parameters - one of them may well be the average call duration for all tariff the company's plans (the "lump together" interfere pre-paid and unlimited), which is multiplied by 2 or 3. However, reliable information on this we could not be found - the press service said nothing, but our sources have expressed only a hypothesis.
Even though some controversial moments from this point of view function interrupt lengthy conversations on mobile networks look justifiable. However, it remains unclear following - as noted Elena Golikov, Manager of Public Relations and Marketing Communications, Ericsson Eastern Europe and Central Asia, "in terms of hardware features off calls after a certain period of time can be installed on the network entirely, and for selected groups . However, the final tuning is done solely on the basis of the solution provider. To the system of pre-paid argument about how to disable call after 30 minutes of talk generally applicable, since another mechanism operates here - you say, until the funds remaining. "
It turns out, may be exempt from such a function, say, unlimited subscribers, or specific rate plans - but the operators except the MCC prefer to put restrictions on all types of calls, even on net calls its own subscribers. In this regard, the position was puzzled Support Company SonikDuo - I asked him to comment on the situation with the interruption of communication. And among other information, I got curious enough text - the duration of the incoming call is limited to 30 minutes due to technical reasons and does not depend on your plan and whether with a phone call is made ... settings of your network equipment can forcibly terminate the connection of long duration. .. because these settings are made in the manufacture of switching equipment, is currently between CJSC "Sonic Duo" and supplier of networking equipment are negotiating how to adjust. "
Thus, for all users of cellular phones on the surface "floats" are not very happy fact - to talk much as he wants, it is hardly possible in principle, any operator forcibly closes the connection after a certain period of time, like it or not, will have to dial again. The most unpleasant thing in this - the fact that none of the subscribers will not warn them in advance and remains constant wonder "dumping" in the long process of continuous talk time. Moreover operator absolutely do not care about the type of call (the city-mobile, mobile-mobile), as far as the conversation is important (the usual chatter or discuss details of the contract) and whether one party adequately perceived by remote connection. By the way be subjected to such a procedure is not very pleasant "break" can each subscriber - for example an hour talking with mobile to mobile MTS is worth 60 cents (using tandem Optima + superlyubimy Room "), and an hour-to-mobile call, mobile network Megafon - $ 1 80 cents (Rates on `Light). And really quite insulting bezlimitnikam, paid the one hundred and fifty hundred dollars for the opportunity to speak without restriction at all (meaning local calls) - they have a "break" is quite predictable fury. Indeed, despite assurances by the subscriber services that the percentage of calls with duration of more than 30 minutes does not exceed 0,005% of the total number of connections ", in absolute terms it's still thousands of interrupted conversations.