Upgrading phone line to fiber optic cable changes number?i need help!

my line men told if u upgrade to fiber optic ur number will be changed is it true??i need help!!!

Yes if your exchange is running on copper only.

ok thanx

Yes this is indeed true. The ONU numbers are a different series from the numbers assigned for copper wire connections. You can not retain your previous number because you are assigned a number from the ONU series, and also because you use a different network than your previous one.

It means If exchange is on fiber, then no. will not be changed.

Are there any charges to switch to ONU?