The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Hong Kong Telecommunications (HKT) Limited:
PCCW On-the-go (Enterprise) enables you to manage your business line anytime, anywhere. You can always keep connected with your business partners and client as if you were staying in your office. FeaturesMobile officeNow you can make and receive your office calls via Internet call by your iPhone even if you are out of office.Single-number displayYou can always show your office number to callers a number that represents you best.Visualized voicemail boxYou can now listen to your office phones voicemails via a user-friendly interface, no matter where you are.Notes1)PCCW On-the-go supports iOS 5.1.1 or later.