What is the expected cash conversion rate for Nokia in the long term, assuming more normal net working capital development
net sales side, EUR 22.6 billion to EUR 23.8 billion, and the comparable operating margin between 11% and 13.5%. Free cash flow, we actually have changed how we guide that in the future. So now it's a conversion from comparable operating profit to cash flow. And we believe that in 2022, that will be between 25% to 55%.
And let's look into each of these in a little bit more detail, what is the background and support for these. Starting with the top line. If we look at the operating -- the addressable market, we see that it's growing about 3% on constant currencies. And we see growth across all businesses.
In Mobile Networks, the driver is 5G deployments. In Network Infrastructure, it is connectivity, investments in national broadband initiatives and also the fixed wireless. And when it comes to cloud and network services, we see continued growth in enterprise sector, especially in private wireless, but also Webscale like Edge computing. And regionally, I would say that we see growth in all regions, especially in North America, Europe and Asia Pacific.
And of course, without the constraints that we see in the supply chain, I think we would see higher growth than this as well. Just a couple of words about Mobile Networks as well. This is now excluding China. And Network Infrastructure is excluding the Submarine business.
And mobile networks growth of 3%. I would say that if we compare with external analyst firms like Dell'Oro, this is pretty much aligned with their expectations as well. This is now in constant currencies in euros, while they usually have USD. And also the perimeter is a little bit different.
They only look the RAN while we have a little bit wider perimeter. And if we look at operating margin, we can see that starting from '21 and excluding the one-offs, about 150 basis points we land at 11%. And we see that sales growth and operational improvements will be the main driver of the margin improvements during this year, of course, tempered by the impact from supply chain costs, general cost inflation and also our own investments for the future. So 2022 will be a continuation of the path toward our long-term targets.
And then finally, when it comes to our cash flow guidance. In 2021, we had very strong cash conversion, almost 90%. And in 2022, most of these factors will be similar to '21. But we assume increased outflow of net working capital as we build more inventory.
And I believe also we will have more normal customer payments. When it comes to Nokia Tech, we're going to have about EUR 450 million impact from the prepayments that we have received in earlier years. And this together will lead to cash conversion between 25% to 55%. In the long term, when we see more normal net working capital development, we believe that cash conversion should be between 55% and 85%.
But also, if you take 2021 and '22 together, we will actually be already around that area that we see in the longer term. So thank you from my side. And back to you, David. 
David Mulholland
Thank you, Marco, and thank you, Pekka, for the presentations. Before we move to the Q&A session, I just wanted to give you all a date for your diaries. Following on from the Mobile Networks progress update that we did back in December, our next event for progress updates will be on our Network Infrastructure business, and that session will be held on Thursday, the 17th of March. We'll send the details out to you shortly.
With that, over to the Q&A. As a courtesy to others in the queue, could you please limit yourself to one question. Rachel, could you please give the instructions?
Questions & Answers:
Operator
Thank you. We will now begin the question-and-answer session. [Operator instructions] I will now hand the call back to Mr. David Mulholland. 
David Mulholland
Our first question comes from Andrew Gardiner of Citi. Andrew, please go ahead.
Andrew Gardiner -- Citi -- Analyst
Thank you, David. Good morning, guys. Appreciate you taking the question. I had one on the sort of revised long-term margin target, please.
You spoke, Pekka, about the phases of the s
net sales side, EUR 22.6 billion to EUR 23.8 billion, and the comparable operating margin between 11% and 13.5%. Free cash flow, we actually have changed how we guide that in the future. So now it's a conversion from comparable operating profit to cash flow. And we believe that in 2022, that will be between 25% to 55%.
And let's look into each of these in a little bit more detail, what is the background and support for these. Starting with the top line. If we look at the operating -- the addressable market, we see that it's growing about 3% on constant currencies. And we see growth across all businesses.
In Mobile Networks, the driver is 5G deployments. In Network Infrastructure, it is connectivity, investments in national broadband initiatives and also the fixed wireless. And when it comes to cloud and network services, we see continued growth in enterprise sector, especially in private wireless, but also Webscale like Edge computing. And regionally, I would say that we see growth in all regions, especially in North America, Europe and Asia Pacific.
And of course, without the constraints that we see in the supply chain, I think we would see higher growth than this as well. Just a couple of words about Mobile Networks as well. This is now excluding China. And Network Infrastructure is excluding the Submarine business.
And mobile networks growth of 3%. I would say that if we compare with external analyst firms like Dell'Oro, this is pretty much aligned with their expectations as well. This is now in constant currencies in euros, while they usually have USD. And also the perimeter is a little bit different.
They only look the RAN while we have a little bit wider perimeter. And if we look at operating margin, we can see that starting from '21 and excluding the one-offs, about 150 basis points we land at 11%. And we see that sales growth and operational improvements will be the main driver of the margin improvements during this year, of course, tempered by the impact from supply chain costs, general cost inflation and also our own investments for the future. So 2022 will be a continuation of the path toward our long-term targets.
 And then finally, when it comes to our cash flow guidance. In 2021, we had very strong cash conversion, almost 90%. And in 2022, most of these factors will be similar to '21. But we assume increased outflow of net working capital as we build more inventory.
And I believe also we will have more normal customer payments. When it comes to Nokia Tech, we're going to have about EUR 450 million impact from the prepayments that we have received in earlier years. And this together will lead to cash conversion between 25% to 55%. In the long term, when we see more normal net working capital development, we believe that cash conversion should be between 55% and 85%.
But also, if you take 2021 and '22 together, we will actually be already around that area that we see in the longer term. So thank you from my side. And back to you, David. 
David Mulholland
Thank you, Marco, and thank you, Pekka, for the presentations. Before we move to the Q&A session, I just wanted to give you all a date for your diaries. Following on from the Mobile Networks progress update that we did back in December, our next event for progress updates will be on our Network Infrastructure business, and that session will be held on Thursday, the 17th of March. We'll send the details out to you shortly.
With that, over to the Q&A. As a courtesy to others in the queue, could you please limit yourself to one question. Rachel, could you please give the instructions?
Questions & Answers:
Operator
Thank you. We will now begin the question-and-answer session. [Operator instructions] I will now hand the call back to Mr. David Mulholland. 
David Mulholland
Our first question comes from Andrew Gardiner of Citi. Andrew, please go ahead.
Andrew Gardiner -- Citi -- Analyst
Thank you, David. Good morning, guys. Appreciate you taking the question. I had one on the sort of revised long-term margin target, please.
You spoke, Pekka, about the phases of the s