Maxcom MM821BB Manual page 38

You can set the ring when the mobile phone is
uncover
²
menu→setting→contextual model→normal mode
→personal setting→cover
You can set the ring when the mobile phone is
cover.
²
menu→setting→contextual model→normal mode
→personal setting→system prompt
Can open/close prompt tone
²
menu→setting→contextual model→normal mode
→personal setting→intelligent call alert
Can open/close intelligent call alert
attention：
contextual model include normal mode, mute mode，
conference mode and outdoor mode. These mode can
be operated except mute mode.
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