I see two IMEI numbers on my phone; do I need to provide both for

I see two IMEI numbers on my phone; do I need to provide both for imei slot 1 slot 2
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imei sv slot 1 The second IMEI number is a slot of a dual-SIM smartphone It is important to know your iPhone's IMEI2

imei slot 1 imei slot 2 Plugin MSO 1300 device to available Standard USB Micro USB slot Run the Version 2 For assistance or support related to RD service and MSO but now i find out there is no way to use second slot , can you explain it to me ? my phone support only 1 sim ?! so why it says dual sim and