US wireless carrier T-Mobile temporarily halted sales of the Sidekick mobile phone Monday after a server failure caused many customers to lose personal data such as contacts and calendar items.

Sidekick models were listed as temporarily out of stock on the T-Mobile website following the incident with Sidekick data services provider Danger, a subsidiary of Microsoft.

T-Mobile and Microsoft-Danger apologized to customers for the data loss in a statement over the weekend.

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