hi restriction code is nothing but your mobile is locked to a particular network due to this it accepts only that particular network sim.to solve the problem you must unlock the mobile .there are many ways to unlock the mobile we can sue software,cable,codes etc...... among them codes are the best .here if you had specified the provider to which your mobile is locked then it will be helpful for me to guide the exact place .however you can get the codes from here
mobile-unlcoker here they ask the imei number of the mobile and finally they will send you the unlock code as soon as possible.
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