If you happen to bought the BQ Aquaris M5 with a subscription, it is probable that most SIM cards of other cellphone providers are blocked on the BQ Aquaris M5. To run the SIM cards of other telephone providers, we need to SIM unlock your smartphone. To get this done, a few techniques are viable.
In the case you bought the BQ Aquaris M5 with your subscription package, you could ask your provider to Sim unlock your phone. This is a service that is totally free. You will only need the IMEI number of your laptop before you call.
In case you purchased your BQ Aquaris M5 used, know that you are able to Sim unlock via online services. These tools are usually paid and you must invest between 10$ and 25$ for a Sim unlock.
Finally, if you do not deposit to online services, it is still possible that you Sim unlock your BQ Aquaris M5 by going to a shop that exercise this sort of manipulation. There is a lot and you'll not have problem finding. Do not spend more than 30$ to unlock your BQ Aquaris M5.