How to block, mark as spam, or unblock phone numbers on Tecno devices

Tecno Phantom 8 Tecno Phantom 8
Tecno S6 Tecno S6
Tecno Spark Pro Tecno Spark Pro
Tecno WX3 P Tecno WX3 P
Tecno WX3F LTE Tecno WX3F LTE
Tecno Camon CM Tecno Camon CM
Tecno Camon i Tecno Camon i
Tecno W3 Pro Tecno W3 Pro
Tecno Camon i Air Tecno Camon i Air
Tecno Spark CM Tecno Spark CM
Tecno Camon X Tecno Camon X
Tecno Camon X Pro Tecno Camon X Pro
Tecno F1 Tecno F1
Tecno F2 Tecno F2
Tecno F2 LTE Tecno F2 LTE
Tecno Pop 1 Tecno Pop 1
Tecno Pouvoir 1 Tecno Pouvoir 1
Tecno Camon i Sky Tecno Camon i Sky
Tecno Pouvoir 2 Tecno Pouvoir 2
Tecno Camon i Click Tecno Camon i Click