Won’t send mms Messaging to android phones

Go to Settings/Messages and turn on MMS. If there is no switch for it contact your carrier to have the feature provisioned on your account. Once it is on note that MMS requires cellular data, so if your only data connection is Wi-Fi you cannot send or receive MMS.

Settings > Messages > MMS Messaging. Be sure that it is enabled. If it is, then contact your cellular voice provider to have them assist you with this as it is one of your provider's services.