Helper Data not found in magento

Your helpers declaration should look like this:

<global>
    <helpers>
        <globalsms>
            <class>Php_GlobalSms_Helper</class>
        </globalsms>
    </helpers>
</global>

and you should call your helper in the code like this:

Mage::helper('globalsms');

Your module name in module.xml is different in config.xml.

I'm not sure myself what you want to use, Php_GlobalSms or Ucs_GlobalSms?

If you enable compilation (System > Tools > Compilation), you need to disable or re-compile it. It is the best that you disable Compilation when you do development.