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.