Have Wi-Fi connection but no IP address (Status: IP address no longer valid)

Dear experts,
I can connect my Pearl 9100 to my home Wi-Fi network but I cannot connect to the internet.  For example, when I run the the Browser I get the message "Unable to connet to the Internet..." . 
I can see on my router that Pearl has been assigned an IP address vi DHCP (just as one would expect). 
From "Manage Connections / Wi-Fi Options / from Saved Wi-Fi Profiles I select my profile / Wi-Fi Tools / Wi-Fi Diagnostics" I see that "Local IP Adress:" is blank and this "Status: IP address no longer valid"
I deduce that something is wrong on the Pearl because it is not accepting the TCP/IP configuration served to it by my DHCP server (my wireless router).
Does anyone have any recommendations to help me fix this?
Here are some other details to consider:
All other wireless devices work on my home Wi-Fi network including a Blackberry Bold 9780 running OS 6.
My Pearl 9100 has OS v.5.0.0.748.  This is an OS updated from Blackberry specific to my carrier (Bell) from the OS 5.0.0.604 which came on the device.
I do not have a data plan on my Blackberry (you may think this strange, but hey, that's the way I want it).  The Bold 9780 that did connect to my home Wi-Fi network did not have a data plan either.  The absence of a data plan should not be a problem because all I need connection to the Internet for is the occassional use of the Browser when Wi-Fi is available.
Thank you in advance for any tips, tricks or pointers.
Solved!
Go to Solution.

Hey - I found the solution:
Options / Mobile Network / Data Services - change from "OFF" to "ON"
I guess I was mistaken in thinking that "Data Services" only needed to be turned on if you have a Data Plan.
Maybe this will help others...

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