After upgrade to 3.0, I loose connection after wifi to cellular network

After upgrade to 3.0, When I quit a wifi zone, I loose connection to cellular network. I have to restart the IPhone to find the cellular network. I am on FIDO with a candian number.
That look like the phone can't jump to the cellular network.

http://shop.o2.co.uk/update/settings.html
Data Settings for Pay & Go and Pay Monthly
(non iPhone tariff) customers
If you're a Pay & Go customer and have the iPhone OS 3.0 Software, you'll need to change your iPhone APN (data) settings. This will get features like mobile internet and picture messaging (MMS) working. Details below.
If you're a Pay Monthly customer but don't have the iPhone Bolt On, or a specific iPhone tariff, then you won't be able to get the full iPhone experience.
Here's what you'll need to do:
From the main screen of your iPhone tap Settings > General > Network
It has done thre same for UK pay and go:
http://shop.o2.co.uk/update/settings.html
Under Cellular Data Network
For Pay & Go customers. Tap APN and change idata.o2.co.uk and enter payandgo.o2.co.uk (Please note that "o2" needs to be written with a letter "o" and not a zero)
For Pay Monthly customers. Tap APN and change idata.o2.co.uk and enter mobile.o2.co.uk (Please note that "o2" needs to be written with a letter "o" and not a zero)
You don't need to change your username and password
Ignore the Visual Voicemail APN box - it's not available to Pay & Go customers or Pay Monthly customers (with a non iPhone tariff)
Under MMS
For Pay & Go customers. Tap APN and change idata.o2.co.uk and enter payandgo.o2.co.uk (Please note that o2 needs to be written with a letter o and not a zero)
For Pay Monthly customers. Tap APN and change idata.o2.co.uk and enter wap.o2.co.uk (Please note that o2 needs to be written with a letter o and not a zero)
You don't need to change your username and password
Turn your iPhone off and on again
If you're a Pay & Go iPhone customer, using your iPhone sim for the first time, you'll need to top up by at least £10.

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QuickTime 7.6
FairPlay 1.2.12
iPod Updater Library 8.1d19
CD Driver 2.1.0.0
CD Driver DLL 2.1.1.1
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Video Display Information
NVIDIA, NVIDIA GeForce 7150M / nForce 630M
** External Plug-ins Information **
No external plug-ins installed.
** Network Connectivity Tests **
Network Adapter Information
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Description: Broadcom 802.11b/g WLAN
IP Address: 192.168.1.46
Subnet Mask: 255.255.255.0
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DHCP Server: 192.168.1.1
Lease Obtained: Thu Mar 19 17:21:09 2009
Lease Expires: Fri Mar 20 17:21:09 2009
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192.168.1.1
Adapter Name: {77A7BD18-8306-4396-9F99-14DC697E3825}
Description: NVIDIA nForce Networking Controller
IP Address: 0.0.0.0
Subnet Mask: 0.0.0.0
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DHCP Enabled: Yes
DHCP Server:
Lease Obtained: Wed Dec 31 19:00:00 1969
Lease Expires: Wed Dec 31 19:00:00 1969
DNS Servers:
Active Connection: LAN Connection
Connected: Yes
Online: Yes
Using Modem: No
Using LAN: Yes
Using Proxy: No
SSL 3.0 Support: Enabled
TLS 1.0 Support: Enabled
Firewall Information
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Connection attempt to Apple web site was unsuccessful.
The network connection timed out.
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The network connection timed out.
Secure connection attempt to iTunes Store was unsuccessful.
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After upgrade to 3.0, I loose connection after wifi to cellular network

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