Please Help With Cl75 Poppy Problems!

[iluvbluetooth]

hi. my phone is a CL75 Poppy (from tescos) and recently when ive turned it on, it has locked me out with the message 'SIM WEP lock fail' what do i do? i dont know anything about codes or how 2 put them in, so if anyone can help, id b sooo grateful.
my IMEI is: 356328007351021

thanx.:confused: