Hello,<br/><br/>To make this work, there needs to be a mobile phone.<br/><br/>Is this ok, or the "TO DO SOMETHING" requires an active sentence like<br/><br/>To make this work, we have to have a mobile phone.<br/><br/>Thank you.<br/><br/>p.s. I ask because the sentence can be written as<br/><br/>THere needs to be a mobile phone to make this work. (I know that this is correct.)