Instructions for blocking, marking as spam or unblocking phone numbers on Cubot devices

Cubot X18 Plus Cubot X18 Plus
Cubot R11 Cubot R11
Cubot P20 Cubot P20
Cubot Power Cubot Power
Cubot Nova Cubot Nova
Cubot J3 Cubot J3
Cubot J3 Pro Cubot J3 Pro
Cubot King Kong 3 Cubot King Kong 3
Cubot Quest Cubot Quest
Cubot A5 Cubot A5