Any recommendations for VoIP solutions?

#asknostr

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Context:

I love nostr:nprofile1qqsxp4fkwhc8mm5704mezrh6g35zmp7t2v338wnxhr6yf8tyj9ezj6cppamhxue69uhkumewwd68ytnrwgqjzamnwvaz7tmwdaehgu3sxyhxxmm4de6x2unrd3hkx6mhd9ek2tnfduq3camnwvaz7tmjv4kxz7fwvajk26mfv9kjuum9wfmxjcm9wvz3cg74, but it gets expensive if you want to have a phone number or perhaps even rotate it once in a while..

Also, my understanding is that it's better for privacy to buy data from silent.link and to use VoIP for phone calls...