Plus signs (“+”) disappears

[Jetnet]

I am sending sms to cellphones using PHP and an API key provided by my sms service provider.The sms that I send reaches the target cellphone perfectly but the problem is when I have a \[code\]"+"\[/code\] sign in my message the \[code\]"+"\[/code\] do not appear in the cellphone. This is probably happening because the \[code\]"+"\[/code\] sign is basically used for indicating a space. When I run the api my code looks like following:\[code\]$msg="A+";$x= file_get_contents("http://someurl...&msg=$msg");\[/code\]Could you please tell me what to do to make the \[code\]"+"\[/code\] appear in cellphones.Thanks