I have been in Spain for 5 weeks. I am on magenta max with a new iphone 12 mini. My wife also has the iphone 12 mini, on the same plan and the same issue: Roaming on vodaphoneES, with full (four) bars connection I get a max download speed of 0.17mbps and 0.21 mpbs for upload (on speed test). Consistently. It is difficult even to read menus at restaurants seems they all have gone the way of QR code at the table. It is infurating.
I have had several tickets opened and none resolved. It would be good to see I am not the only one: are there other users out tehre experiencing the same? The latest ticket was opened last Saturday Oct 16, 2021: “Thank you for being a valued T-Mobile customer! Trouble Ticket # 37677334 has been opened on your account. Please allow 3 business days for teams to review. Resolution can take longer depending on the issue.” Opening the ticket was the result of a direct conversation with technicians (the umpteenth one) that closed the previous ticket because they determined the problem was with vodaphone. Since I know people here I checked with my friends who have local vodaphone accounts and found out they have absolutely no problem -- it si not an intrinsic vodaphone network problem. So the current ticket is for t-Mobile tech’s to contact vodaphone and try to figure it out.
Please, other users with this problem, open more tickets! Complain loudly everywhere you can, maybe t-Mobile will notice