Is there a difference? I did not know there was 2 versions. Is it because the more expensive version(23-a) has a phone jack?

I contacted the same seller too. He told me the same thing. Its a good price but then again I'm also looking for B525 with phone port. You never know when you're gonna need to make phone calls....

B525-23A can connect with house phone, Eg. Cordless DECT phone. 65A cannot connect to house phone. Sing 4G at Lowyat got sell both versions. Get the more expensive version. Check in the description to make sure you're buying the 23A version. It costs me around Rm 880 including two antennas. Without antenna, it will cost you RM 850. This modem is Cat 6 model. Not sure about the other models you mentioned.

You gotta use the huawei apk manager. The link is
https://drive.google.com/file/d/0BxnFY4Thp8...VZ2SUxaaU0/view
From you can choose the band which you lcok onto. The forum users advised that you do not update the app for fear that it may brick your modem. So no matter what do not update the app even though it says so.