I purchased a prepaid tourist sim from one of the TMobile stores and lost my receipt (paid cash). I tried to retrieve it by starting a My T-Mobile account but the system doesn't let me open an account. Is there any way for me to try and get a copy of the receipt?
Cash receipts would not be available online. If the store activated a phone number for you with the SIM, another store may be able to locate the purchase in their system. However, if it was cash and no activation, there won't be a way to retrieve the receipt.