Is this problem only from your home computer and iPhone?
Are they both with the same service provider?
Sounds like they are trying to pick up the old server so maybe there's a DNS cache problem. These should have cleared world wide a few days at most after the server change over but who knows.
Try flushing the DNS in the computer and if this works have a go at the iPhone.
How to Flush DNS in Microsoft Windows
In Microsoft Windows, you can use the command
ipconfig /flushdns to flush the DNS resolver cache. Open the command prompt and type the following:
C:>ipconfig /flushdns
Windows IP Configuration
Successfully flushed the DNS Resolver Cache.
The above command will completely flush the DNS, deleting any incorrect entries too. You can also use the command
ipconfig /displaydns to view the DNS resolver cache.
Flush DNS in Mac OSX
In Mac OSX Leopard, you can use the command
dscacheutil -flushcache to flush the DNS resolver cache:
bash-2.05a$ dscacheutil -flushcache
In Mac OSX versions 10.5.1 and before, the command
lookupd -flushcache performed the same task:
bash-2.05a$ lookupd -flushcache
iPhone - How to Flush DNS
Step 1 - Turn iPhone off and turn it on again. Press and hold the Sleep/Wake button on top of iPhone for a few seconds until a red slider appears, and then slide the slider. Then press and hold the Sleep/Wake button until the Apple logo appears.
Step 2 - Reload your iPhone Safari page.
If this doesn't work please post back in here and we'll see what else can be done.
Gheers - Neil