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In this paper, we analyse the performance benefits of a transport layer approach to utilising multiple cellular networks with regard to throughput and availability. First, we provide a nationwide capacity analysis based on millions of measurements from deployed mobile networks in Finland. Then, we report our own measurements that were conducted utilising multiple mobile networks with Multipath TCP. All our findings suggest that a multipath transport with access to various operator networks has significant benefits concerning throughput and availability. In some cases, even the overall latency decreases.