HSBC text from the number +447537438060 when they suspect a fraudulent transaction on a customer account. If you receive a text from the number +447537438060 you can be sure that this is actually HSBC and not a scam. This is borne out by a careful examination of the Received a Text? page on the HSBC website.
After the initial text will be another text including an instruction to call a landline number, which can be used to get more information and inform them whether it was you who made the transaction or not.
Although the number +447537438060 is a genuine HSBC number, we advise any and all HSBC customers to be careful with any communication from a bank to your mobile. If you are in any doubt then contact the bank using a customer service number taken from the HSBC website.