Before revision: It was possible to use specially adapted dialup modems over cellular connections, but this was slow (typically topping out at 9.6 kbit/s), expensive (per-minute charges applied), and often flaky .
After revision: It was possible to use specially adapted dialup modems over cellular connections, but this was slow (typically topping out at 9.6 kbit/s), expensive (per-minute charges applied), and often unreliable .