Some older toll bar services designed to restrict toll calls (including long distance or calls to mobile phones) will also block calls to these free phone numbers, although this has become less common since the mid-1990s.
一些更舊的收費站服務設計制約收費電話（包括對行動電話的長途或電話）也將阻攔電話對這些自由電話號碼，雖然這變得較不共同從20世紀90年代中期。