The telecoms companies are restricted to offering fixed-line services in certain areas of the UAE.
But under long-delayed plans, customers will be able to choose between operators by the end of this year.
That will extend to voice and broadband packages - but liberalisation of internet protocol television (IPTV) will be further delayed.
"When infrastructure sharing comes, it is most likely that it will cover voice and broadband, and that TV will come at a later stage," said Osman Sultan, the chief executive of du.
The delay is attributable to "technical reasons of interoperability".
While telecoms companies' revenues from television may be "marginal", TV is important because telecoms operators sell internet, landline and TV services as one package, Mr Sultan said.
Any delay in launching a nationwide IPTV service could impede the two operators' contest for customers.
"We do not want to see this situation lasting long," said Mr Sultan. "Interoperability in the infrastructure is good. You should be able to switch easily."
He was speaking on the sidelines of a conference in Dubai on IPTV standards.