By Anton D. Nagy | February 11, 2010 12:29 PM
If you are texting alot and you are used to sending multiple recipient text messages, you might have noticed that the Compose screen is by default limiting you in sending a text message to maximum 10 recipients.
If you find this annoying, you can easily lift that limit via editing your Registry; go to HKLMSoftwareJataayuMessaging and edit the value of MaxRecipients from the default 10 to a number of your choice (I’ve raised it to 30). Soft reset your device and you’ve lifted your SMS recipient limit.
(Source: XDA Developers)