With two new offerings, Wind Mobile is moving more aggressively to lure customers from the incumbent wireless providers and to cement its position before other providers launch services this year. But the efforts are also signs of weakness, analysts said, as Wind struggles to gain subscribers with a young, struggling network and a limited retail footprint. The new provider is offering to absorb the cost of cancelling cellphone contracts, which are used by big wireless providers to make handsets cheaper, with $150 worth of credit over five months.