I have updated S2 to 7.0 OTA, but after upgrade I lost 4G. Only 3G works if I choose it in settings. Did hard reset, changed APN settings. Nothing helped.
So I asked for a new SIM card from carrier and it still didn't work. Now comes the weird part.
I took my 4G card from phone and put it in S2. Everything worked. 4G kicked in immediately. Then I put S2 card in phone and also everything worked with 4g. I returned it back to S2, but it didn't work.

Eventually I downgraded to 6.0.1 and 4G works.

Since it is SEE FW does anybody use some other FW that is similar to SEE regarding localization and that 4G works when chosen? I want to try that as a last option.