T-Mobile US plans to significantly expand the operational footprint of its newly-acquired MetroPCS brand over the next six quarters. Fierce Wireless quotes T-Mobile CFO Braxton Carter, who formerly held the same position at MetroPCS, as saying that the combined company’s focus is now on a ‘more aggressive expansion’ of the latter’s national footprint. Carter said that MetroPCS will be ‘expanding to 15 additional major metropolitan areas very quickly’, stopping short of naming them. However, previously MetroPCS executives have indicated that the company intended to expand into areas such as Houston, New Orleans, San Diego, Seattle, Washington DC and Baltimore. Carter said the expansion will accelerate in the third quarter and through to early 2014. Further, the CFO noted that the ‘back office integration’ between T-Mobile USA and MetroPCS is now essentially complete and said that T-Mobile is ‘weeks away’ from seeding HSPA+ and LTE smartphones into MetroPCS distribution channels.