UAE telco du needs renewed prepaid momentum to end earnings slump - CEO

* Need to regain lost ground in prepaid market - CEO * Q2 profit 445.4 mln dhs, down 11.3 pct y-o-y * Seventh successive quarter of falling profit * Revenue flat despite higher data usage, revenue (Recasts, adds detail, context) By David French DUBAI, July 31 (Reuters) - Du needs to regain momentum in the prepaid mobile market if it is to counteract higher government taxes and halt an earnings slump, the chief executive of the United Arab Emirates' No.2 telecom operator said on Sunday. Osman Sul