I recently bought a Wave 525 GT-S5253 mobile in India. I think it is a unlocked phone since they told me I can use any SIM.
I put the SIM card of a service provider (Softbank) in Japan and I could receive roaming alert messages immediately and could call other numbers as well. That means, the phone should work with that provider.
But when I returned to Japan, the phone stopped working. I replaced the phone with couple of other SIM cards from same provider but it is not detecting the network. It shows a red color circle with a cross inside mark in the left hand top corner (like a no parking sign which means a no signal).
Can anybody help me to resolve this issue?