Depending on the operating system in your old phone, choose the proper method of transferring content to HTC 10.
From an Android phone
On your old HTC or other Android phone, download the HTC Transfer Tool and use it to transfer your content to HTC 10. See Transferring content from an
Android phone.
From an iPhone
Back up iPhone content to your iCloud storage, and then transfer the content to HTC 10. See Transferring
iPhone content through
iCloud.