Here is a list of top 10 mobile networks by subscribers. The list is very dynamic as some operators grow while others shrink. The best example of operator that has been growing rapidly, overtaking others is Reliance Jio.
1. China Mobile, China, 925 million [1]
2. Vodafone Group, UK, 536 million [6]
Note: Vodafone Idea, India has 422 million subscribers [2]
3. Bharti Airtel Group, India, 413 million [4]
Note: Airtel India has 329 million subscribers [3]
4. China Unicom, Hong Kong, 315 million [1]
5. China Telecom, China, 303 million [1]
6. Reliance Jio, India, 280 million [6]
7. América Móvil Group, Mexico, 279 million [5]
8. Telefónica Group, Spain, 272 million [7]
9. MTN Group, South Africa, 221 million [9]
10. Veon Group, Netherlands, 211 million [8]
10. Orange Group, France, 211 million [10]*
* = added later
[1] https://www.mobileworldlive.com/asia/asia-news/china-telecom-narrows-subs-gap-to-unicom/
[2] https://discover.vodafone.in/about-us/home?section=consumer
[3] https://www.airtel.in/about-bharti/equity
[4] https://www.airtel.in/about-bharti/about-bharti-airtel?icid=footer
[5] http://q4live.s22.clientfiles.s3-website-us-east-1.amazonaws.com/604986553/files/doc_financials/quarterly/2018/3Q18.pdf
[6] https://www.mobileworldlive.com/asia/asia-news/jio-profit-surges-on-continued-subs-gains/
[7] https://www.telefonica.com/en/web/shareholders-investors/financial_reports
[8] https://veon.com/Global/Files/Reports/3Q18/Q3%202018-Full%20announcement.pdf
[9] https://www.mtn.com/MTN%20Service%20Detail%20Quarterly%20Quarterly%20Trading%20Upd/MTN_Q12018_Results.pdf
[10] https://rai2017.orange.com/orange2017-content/uploads/2018/05/orag_1802135_ra_150x210_gb_mel.pdf
1. China Mobile, China, 925 million [1]
2. Vodafone Group, UK, 536 million [6]
Note: Vodafone Idea, India has 422 million subscribers [2]
3. Bharti Airtel Group, India, 413 million [4]
Note: Airtel India has 329 million subscribers [3]
4. China Unicom, Hong Kong, 315 million [1]
5. China Telecom, China, 303 million [1]
6. Reliance Jio, India, 280 million [6]
7. América Móvil Group, Mexico, 279 million [5]
8. Telefónica Group, Spain, 272 million [7]
9. MTN Group, South Africa, 221 million [9]
10. Veon Group, Netherlands, 211 million [8]
10. Orange Group, France, 211 million [10]*
* = added later
[1] https://www.mobileworldlive.com/asia/asia-news/china-telecom-narrows-subs-gap-to-unicom/
[2] https://discover.vodafone.in/about-us/home?section=consumer
[3] https://www.airtel.in/about-bharti/equity
[4] https://www.airtel.in/about-bharti/about-bharti-airtel?icid=footer
[5] http://q4live.s22.clientfiles.s3-website-us-east-1.amazonaws.com/604986553/files/doc_financials/quarterly/2018/3Q18.pdf
[6] https://www.mobileworldlive.com/asia/asia-news/jio-profit-surges-on-continued-subs-gains/
[7] https://www.telefonica.com/en/web/shareholders-investors/financial_reports
[8] https://veon.com/Global/Files/Reports/3Q18/Q3%202018-Full%20announcement.pdf
[9] https://www.mtn.com/MTN%20Service%20Detail%20Quarterly%20Quarterly%20Trading%20Upd/MTN_Q12018_Results.pdf
[10] https://rai2017.orange.com/orange2017-content/uploads/2018/05/orag_1802135_ra_150x210_gb_mel.pdf