It is possible to keep your phone number if you switch providers. However, you need to request this yourself before switching. You can arrange this with your provider; most providers have a online function for this.
In some cases, a customer number is necessary to complete the cancelation. Your customer number can usually be found on an invoice or in an online account environment.
To be able to realise the termination of your contract, we need some personal information from you and in some cases a client number. Xpendy also automatically generates a digital signature when generating your cancelation letter.