Upgrading mobile phones

[ffla]

How does a business upgrade it's mobile phones when it comes to the end of a contract? I've tried the messaging services twice and they can't seem to help - the second time they told me I need to contact sales but gave me not details??? I tried ringing and that dropped out. Or do should we try another provider???

[Jupiter]

You should be able to do it through your online account, or go into a Telstra store.

[ffla]

I can't seem to find the upgrade plan section of 'your telstra tools'