They will start deploying LTE on their 800MHz spectrum in 2013 using LTE Advanced's Carrier Aggregation feature. The handoff between their 1900MHz and 800MHz will be totally seamless. Actually there will not be any handoff in the classical sense of the word. Sprint will be refarming the rest of their 1900MHz holdings for LTE and will also use Clear's 2500MHz network for overflow in places like NYC and San Fran.
Sprint and T-Mobile's spectrum pooling was a bigger possibility before T-Mobile decided to use their 1900MHz for HSPA+ and AWS for LTE. I understand their reasons for doing that and fully agree with them. Sprint could definitely host T-Mobile's AWS LTE network on their Network Vision platform.



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