MTN, Africa's largest cellphone operator, says headline and attributable earnings per share for the year to December are expected to gain between 25% and 30%.
The group says in a statement to shareholders that this is due to foreign exchange gains of around R1.1 billion. For the 2012 year, it incurred foreign exchange losses of R2.7 billion.
MTN, which is listed on the JSE, says the gain was mostly thanks to a R2.3 billion exchange rate gain in MTN Mauritius, which was partly offset by foreign exchange losses on "certain operational working capital accounts".
JSE rules require companies to alert shareholders as soon as they are reasonably aware results will differ from the previous comparative period by at least 20%.
The group's results will be published on 5 March.
Last year, it reported revenue up 10.9%, to R135 billion, as data income leapt 58.5%, to R14.6 billion.
Headline earnings per share gained 1.9%, to 1 089.1c, last year, but were negatively affected by foreign exchange losses in Iran, Syria and Sudan, which wiped 178.5c a share off this figure.
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