SIM Lock和CID Lock

SIM Lock
如果你用開手提電話，你對SIM Lock這個英文應該會認識。SIM Lock 是一個限制方法 - 去某間電話服務供應商購買一部PDA Phone但要用指定的該電話服務供應商提供既服務月費計劃。這個限制方法是用來給引客户用一個很便宜價錢去買一部PDA Phone，但要用一個指定月費和選用一個特定時期，用合約形式限制，才可以用享受這個服務。由於有合約限制，解除 SIM Lock 限制有可能觸犯當地法律或違反當地電訊服務供應商的合約
CID Lock
又叫做 Vendor Lock。CID Lock是PDA Phone製造商/電訊商/銷售商用來保議自己公司所推出既產品不會被其它公司的ROM所取代。例如O2 Atom 和HP rw6828 係同一間製造商(Quanta)的代工(OEM)產品，如果你想用HP rw6828的ROM 去取代 O2 Atom的ROM係唔得。O2 和 HP 都有 CID Lock 去保議自己公司所做既ROM。解除 CID Lock 不會觸犯當地法律，但可能使PDA Phone保養失效。
不同OEM製造商的PDA，就算解除CID Lock都不能夠取代對方的ROM。例如你解除O2 Atom CID Lock，但不能夠用Dopod 818pro 的ROM 去取代 O2 Atom的ROM

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