You need to Unlock it using the Unlock code,Because if the Phone not accept other Sim card means it locked to Network,So until unlock it you cannot use other GSM network Sim card.You need to unlock it....You can get the UNLOCK CODE from the site www.theunlockarena.com
and unlock it from Network Lock,Then you can use any GSM network Sim card.Reset code used for resetting from Security lock or password lock.
Try code from service provider.
SOURCE: i cannot put other sim to my sony erission k750i
You need to Unlock it using the Unlock code,Because if the Phone not accept other Sim card means it locked to Network,So until unlock it you cannot use other GSM network Sim card.You need to unlock it....You can get the UNLOCK CODE from the site www.Theunlockarena.com and unlock it from Network Lock,Then you can use any GSM network Sim card.Reset code used for resetting from Security lock or password lock.
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