Is there a way for my MMS message phone numbers not seen by whole group even after turning off group messaging?

I send messages to a group of people but they are all able to see each other's phone numbers and they can't tell who is sending the message because on their iphone all the numbers appear and I have turned off group messaging.  Is ther a way to prevent that from happening? 

I am simply lookig for some help not an argument.  I am not an RF specialist however have setup a few wireless networks in my tenure at Wynn Resorts.  I fully agree that wireless networking is an art and a science however the powers that be in Network Land have toughted wireless networking is the easiest and quickest way to get two computers to talk with one another.  As I previously said I have already turned one (1) MBP in for this problem and Apple decided to replace it because they could not fix the problem with my particular MBP.  This MBP was running Leopard when the problems started
I am having a hard time believeing that there are several other devicces in my home that depend on a wireless network to operate and my MBP is the only one having an issue.  I took this a step further and decided to see what would happen if I tried to connect wirelessly via Fusion.  In Windows 7 I am able to print and scan to my hearts content without any issues.  I am able to browse the internet as much as I want.  I close Fusion and try to connect to my printer via wireless and nothing.
In order to get Apple to help do I need to get a Network Analyzer and capture packets when I have these problems?  Out of the 1000 + posts is there a consolidation of which answer is the best?  BTW I am accessing the internet via a wireless connection using Fusion and Windows 7.
In response to Linc's comments, I will look at the router specifications however I did not qualify that these devices are not using the wireless connection at the same time.  Right now I would guess there are maybe two (2) or three (3) at the most that are actively transmitting / receiving information. --  Thanks

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