Unable to open the Square app on an iPhone

[M2M]

 I’ve got the Square app Loaded on two iPhones

 At this time I am unable to open the app on one of the phones 

 The loading window just Continues to spin

[Kassi_]

Hi @M2M - 

So sorry about that! There isn't a limit to how many logins you can have, so it sounds like an issue with the app. Have you tried deleting the app and installing it again? Also, make sure you have a strong internet or data connection, The app requires a strong connection to ensure it functions properly.