Nope!!! Never change the order. It's not like Russian ...

Like you can't change the word order of English

Actually, you can change the order. But in many cases you need to slightly change the words in order to make it a grammatically correct sentence. In this case, "那边打电话的是我丈夫。" you can also say: 我的丈夫是（在）那边打电话的那(一)位。 if you don't have to stick to “是”, you may also say 我的丈夫在那边打电话。

Sure!! you can say that instead. But the meaning will be: The THING of my husband's is for making a phone call. Lmao!! If that's what you were trying to say. :) Happy learning!!

Do you mean: 我的丈夫在那边打电话？

Or:我的丈夫是在那边打电话的（那个人）？