I have a Huawei E5330 (branded Vodafone Mobile Wi-Fi R207) modem (Mobile Wi-Fi, not to be confused with dongles which connect directly to the USB). I have had it unlocked by Vodafone UK so that I can use in when travelling abroad. I verified that the unlocking worked with an EE SIM. However, it was somewhat difficult to find the right settings as I needed to manually tell the network technology (IPv4 or IPv6), the IPv4 APN, IPv4 Number, Security (PAP or CHAP), IPv4 Username, and IPv4 Password. I am worried that if I enter a mobile store in Spain and buy a prepaid data SIM, I may not be able to use it.
It appears that providers do have APN information, but the other fields are missing. This wiki additionally lists username and password, but still not the technology, Number, or Security. Perhaps smartphones figure out this configuration autonomously, but the Huawei E5330 does not.
What can I do to make sure I will be able to use a data-only SIM purchased abroad in my unlocked Mobile Wi-Fi modem?
Edit: See a screenshot below of the page where I am asked this information. Until I added the fields that are filled in manually below, the Connect button would not do anything. When using a Vodafone UK SIM, the Account type can be set such that the details are filled in automatically (depending on Pay-as-you-go or Subscription-based), but with any other SIM, the only option is Custom.
Screenshot with information page. For the EE SIM I inserted to test that the unblocking worked, I managed to scrape the correct information from a combination of online sources, using a secondary internet access that I won't have when abroad.
*99#, although I added username and password at the same time so I'm not quite sure it needs all or just one of them to actually work. – gerrit Dec 07 '15 at 01:07*99#triggered some really old memories. It was the standard number for making a dialup connection on GPRS. It should work anywhere in the world using GSM/GPRS, including the US (except Verizon, which never used GPRS). It was just a little surprising to see a 3G device asking for it...or any device. Since the number is the same worldwide, and I'm not aware of any exception to that, there seems little reason to allow it to be configurable. But, the Internet tells me Vodafone sucks... – Michael Hampton Dec 07 '15 at 01:11