nozzle,
Good to know that you are relaxed now. But changing no. is not the solution, eliminating the problem is.
Now here is one tip -
Even if the stalker changes his no., I am sure he will be using the same handset. Once you get the no. of stalker, inform it to cyber branch of Police. Using the number, the telecom provider will inform about the IMEI no. of the phone. Using the IMEI no. of phone, even if the SIM is changed, the mobile phone can be tracked & located precisely. What's more, one can even block the IMEI no. rendering that phone useless.
Always go for the root of problem -
First the culprit, next the handset.
Hope this helps.