The credit-based system is very popular. It is easy to understand. You buy a pack of credits. For example, you can buy 1,000 credits. Then, you send messages. Each message you send uses up some credits. The cost of a credit can change. It can change based on the country you are texting. It can also change based on the type of message. For example, a picture message might cost more cre... https://egyptdata.site