[remram]

I'm not sure what you mean when you say "burner phone". I know for a fact that you can get a regular prepaid plan from T-Mobile and pay for it cash, no IDs; that fits the "burner phone" requirements for me. Do you mean that every prepaid plan uses that range of numbers?

[Scoundreller]

Prepaid plan vs post-paid, probably not, but some discount prepaid providers are probably considered “less trust-worthy”, or less profitable when evaluating VoIP numbers.