Not the phone number. That does have a backspace. But once you are through to a company and you have to choose a department by entering a number, say 5, then it asks you to enter your ID or membership number. Now you can't backspace to remove the 5 before entering you ID number, so your ID has a 5 in front of it making it incorrect. I hope I have explained clearly.
But let's say the prom is press 5 for accounts and then you press 5 and then it prompts you to enter your ID number and you start punching it even if the 5 is there it won't send the 5 tone again so you won't have to erase/back space itbefore entering your ID number for example.