it could be your phone line.
Some people are still connected using old exchanges or have poor wiring from exchange to their house. Since it relies on touch dialing to know the numbers perhaps there is too much interference on the line for it to work properly.
Some people are still connected using old exchanges or have poor wiring from exchange to their house. Since it relies on touch dialing to know the numbers perhaps there is too much interference on the line for it to work properly.