How to avoid becoming a victim of the tariff plan.

We have long been accustomed to mobile phones. And so many of us are also used to his phone number and do not want to change it. In that it could lead? How to avoid becoming a victim of the tariff plan?
First - think about it a long time I connect. If after connecting a year has passed, or even six months, the operator could easily have changed unilaterally by your wireless service plan, without prior notice. And you'll wonder where did the money disappear. Transfer to another plan that is usually done for the following reasons: service on this rate plan are not available, or the plan is outdated. Often the caller is not transferred to the most profitable plan. Still want to leave your room?
Second - if the tariff is cheap, it can not guarantee the quality of services provided. If SMS does not reach their destination, and they have to send 10-20 pieces, and you can not get through to people, in response, hearing the gentle voice saying that the subscriber is not online, at a time when his phone is in an adjoining room. Think of saving 3 penny will be justified when an emergency phone will be useless?
Third - you can enumerate all the advantages of corporate tariff plan indefinitely. But the company, not a charitable organization, and if your dismissal phone taken away. Another minus - spending and conversations that are not controlled. The employer compensates not all, of a share provides your wages. You decide - most importantly - control over their spending, or corporate rate.
Fourth - it would seem, many operators have refused the subscription fee, but in practice, the same payment went in another direction. Instead, we have costs for services that provide operators. Many tariff plans include such data services, and that moment, that you at any moment can change the tariff plan, you become a victim of the same monthly fee.
Fifth - the division into cheap minutes, and quite expensive negotiations, since minute call from your phone to landline numbers, can cost five or even 10 times more expensive. There are even some tariff plans in which different prices for different mobile phone operators.