My iPhone won't let me send video's through Viber or iMessage?

I have an iPhone 3g (yes its old, who cares) not sure what update it is. All of a sudden it won't let me send video's and this is a 0:39 video and I use to send like 5 minute videos through imessage no problem now all of a sudden its stopped. I've uninstalled a crap load of apps and pictures and no change in anything. Please help me and tell me what's wrong >:(

Appreciate everyone who helps

You check the iOS Version by going to Settings>General>About>Version

Version states what is your current operating system version.
Your highest version is 4.2.1
if you can confirm which iOS it is then maybe we can help you better

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