1incoming telephone call (or telegram)
2to phone in; to send in a telegram
3to have an instant attraction to sb
4(of electricity, after an outage) to come back
Example
dàng当nǐ你yǒu有xū yào需要huò或zhǐ shì只是xiǎng想shuō huà说话shí时，qǐng请lái diàn来电！
当你有需要或只是想说话时，请来电！
If you need something or want to talk, feel free to call.