Do I have to change my internet phone when I move my internet carrier?

I'm using LG U+ right now.

I heard that you can use SKB for free if you use SKT, so I'm looking into it.

If I move my Internet carrier to SKB, do I have to change my Internet phone to SKB?

Then should I cancel the LG U+ Internet phone I'm using now and will my phone number disappear?

414 2017-04-14 Gentleman

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