Time for Q1 Quarterly data for smartphone market. The average of the big analyst houses gives us a total market size in calendar Quarter 1 (January-March) of 2018 as 339.9 million smartphones sold globally. That is down 3% compared to the same quarter a year ago. This period is the gift-giving season in China and Chinese sales (and brands) tend to overshadow others in this quarter. Lets do the big table:

BIGGEST SMARTPHONE MANUFACTURERS BY UNIT SALES IN Q1 2018

Rank . . . Manufacturer . Units . . . Market Share . Was Q4 2017
1 (2) . . . Samsung . . . . 78.2 M . . 23.0% . . . . . . . ( 18.4% )
2 (1) . . . Apple . . . . . . . 52.2 M . . 15.4% . . . . . . . ( 19.1% )
3 (3) . . . Huawei . . . . . . 39.3 M . . . 11.6% . . . . . . . (10.3% )
4 (x) . . . Xiaomi . . . . . . 28.2 M . . . 8.3% . . . . . . . (6.9% )
5 (4) . . . Oppo . . . . . . . . 24.0 M . . . 7.1% . . . . . . . ( – )
Others . . . . . . . . . . . . . . 118.0 M
TOTAL . . . . . . . . . . . . . 339.9 M

Source: Average of IDC and Strategy Analytics public numbers [1] [2]
This table may be freely shared

Thats the big table. Samsung is of course the biggest. Apple is safe in second place, with Huawei lurking back there solidly in third rank.

The OS wars is 85% Android, 15% iOS and a rounding margin error including all others. But note, of Android, one third are forked AOSP devices (maybe more this quarter with China sales at its annual peak level)

REFERENCES:

[1] https://venturebeat.com/2018/05/02/idc-smartphone-shipments-down-2-9-in-q1-2018-apple-gains-on-samsung/

[2] https://www.strategyanalytics.com/strategy-analytics/news/strategy-analytics-press-releases/strategy-analytics-press-release/2018/05/01/strategy-analytics-apple-grabs-share-as-global-smartphone-shipments-dip-to-345-million-in-q1-2018