Sorry if my title is confusing. In the past, I've ported some landlines from various providers to T-Mobile, and then to Google Voice. I would often the $10 sim card as a $3/month pay as you go account. So, it was only $15 for T-Mobile, and $20 for Google Voice porting.
I've been asked by friends to help their parents port their numbers from Spectrum (VOIP landline) to Google Voice. Today, when I went into the T-mobile store, I was informed that the $3 pay as you go plan is gone. The cheapest plan was around $50/month. That's a no-go.
What are other ways I can port the number from Spectrum to an intermediary and then to Google Voice. I really appreciate your help.