you can start by running a wireshark trace on the server where your ipps is
hosted,
and analyse the http requests and response from/to the phone

I'm one step closer.  I ran SQL Profiler and did a trace of the service as I ran it.  On the 7942 phones, it ran fine.  On the 8941, I found the issue.  I'm just not sure how to solve it. 
Below is the code that runs, then the SQL that goes through the trace.
SERVICE PAGE CODE
var input = Request.QueryString("input");
var input2 = input * 1;      // I did this math to ensure that the data comes through as a number.  The datatype of the field is numeric(15,0).
sql=("SELECT * FROM dbo.vw_User_PinList WHERE PERSON_ID =("+input2+") ");
TRACE RESULTS ON 8941 PHONE
SELECT * FROM dbo.vw_User_PinList WHERE PERSON_ID =(Nan)
select * from SELECT * FROM dbo.vw_User_PinList WHERE PERSON_ID =(Nan)
(At this point, the user receives HTTP Connection failed, they try again, and this is what goes through:
SELECT * FROM dbo.vw_User_PinList WHERE PERSON_ID =(73220)
***********
I then changed the SQL query from requesting Input2 to input, leaving it as a string, to see what it was submitting.
Here's what I found:
TRACE RESULTS
SELECT * FROM dbo.vw_User_PinList WHERE PERSON_ID =(%2073220)
select * from SELECT * FROM dbo.vw_User_PinList WHERE PERSON_ID =(%2073220)
User gets - http connection failed - tries again.
SELECT * FROM dbo.vw_User_PinList WHERE PERSON_ID =(73220)
So it looks like there is a Space coming through with the number, only on the 8941 phones.
I'm going to try and add a "trim" statement to see if that works. 
Any other ideas out there?  all help is much appreciated.  Thank you.  Cindy