Give it a few minutes before logging on
As soon as I paid for it, I tried logging in for the first time to use the whatsapp android > ios transfer...and get the message: 'your account has exceeded its limit of number of connect' However after I had started to write up a negative review on here, I tried logging in again (probably 5 mins after setting it up) and it worked. It was long and quite complicated, lots of settings and special modes to put the phones into etc but overall a positive experience if overpriced.