3 has appointed seven new accessories suppliers to work alongside existing provider Kondor.
The network has struck deals with i-Tech, Celtic Telecoms Consultants, Dextra Solutions, Pama, Clockwork Logistics, Modelabs and Strax.
It said its new multi-source strategy would allow it to choose the best products from each company as well as for more competitive pricing.
A spokeswoman said: “We are moving to a multi-source strategy to ensure that we get the best products for the consumer at a price that is right.
“Following this review, an additional focus will be placed on selling accessories through all our direct channels.”
3 has also appointed former Carphone Warehouse accessories buyer Ana Vasquez to take care of its accessories department.
Vasquez will report directly to finance and commercial operations head Steve Leadbetter.
Vasquez said: “We are looking to offer customers the best products and prices in the market. With a great new group of suppliers on board I’m confident we will be able to achieve just that.”