T-Mobile's Mobile Backup and Sprint's three backup services work automatically: Every time a phone's address book changes, a sync is initiated.
T-Mobile移动备份和Sprint的三各备份业务可以自动工作：一旦地址簿改变，就开始同步。
T-Mobile's Mobile Backup and Sprint's three backup services work automatically: Every time a phone's address book changes, a sync is initiated.
T-Mobile移动备份和Sprint的三各备份业务可以自动工作：一旦地址簿改变，就开始同步。
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