Is this eSIMAdventures Lesotho plan valid if I cross back into South Africa?

No, your eSIMAdventures Lesotho plan is specifically designed for use within Lesotho. As most adventurers enter and exit Lesotho via South Africa (e.g., through border posts like Maseru Bridge or near Underberg for the Sani Pass), it's crucial to remember that your data connection will cease once you re-enter South African territory. For continuous connectivity across both nations, especially if you plan multiple crossings, consider a regional Southern Africa eSIM from eSIMAdventures to keep your adventures seamlessly connected.