RIO DE JANEIRO, BRAZIL - From Thursday, March 10, the use of prefix 0303 in calls made to customers by telemarketing companies is mandatory. The change, announced at the end of last year by the National Telecommunications Agency (Anatel), aims to help users quickly identify this type of call and decide whether to take it.
The code will appear at the beginning of the number of any call aiming to offer products or services. The changes are . . .
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