Optimal rate

The service of choosing the most optimal operator and mobile communication tariff.
We indicate our phone number (not all operators support) and receive detailed information about our calls by email:

1. Number and duration of calls
2. How many calls to which Times of Day.
3. Where and how many called (their operator, other people's operators, landlines).
4. How many of us are calling outside our area.

Service is paid, but not expensive. Especially if it's about the company. Here, the savings can be significant.
Besides, you can just buy a program and use it as much as you need.

https://prepaid-data-sim-card.fandom.com

About tariff plans and SIM-cards almost in the countries of the world.

If we are going to go to another country, roaming is not always an option.
If you are going to actively use the phone, it is much cheaper to buy a local SIM card.

On the site choose a country, we get a list of operators and tariffs.
Pay attention to additional information, for example, how much a SIM card will have to wait, it may be several weeks. Somewhere need fingerprints, but somewhere and a passport is not needed, just pay and take.