title: Inserting a variable inside a String
body: <p>This is probably a pretty simple issue but since I'm working with 1.3 IDE I can't use the most common method to do this.</p>
  
  <pre><code>String at_cmd_response = atc.send("AT+CMGS=\"+35111111111\"\r");
  </code></pre>
  
  <p>I need to introduce a string called number which holds a number like "<strong>35191xxxxxxx</strong>" in <strong>at_cmd_response</strong>. To do so, I've seen the String.format method but I can't use it due to my IDE.</p>
  
  <p>Is there another way to do this?</p>
  
  <p>Thanks</p>