I've had two different unihertz models, and neither of them could stay on any wifi, and both of them dropped calls like crazy. I contacted customer support, and they 'offered' to swap for another exact same phone, if I paid to ship both ways, and I didn't mind having no phone for a month. Jelly 2, and Atom XL. The Atom was especially bad as it has a giant bloody antenna sticking out the top of it, and still no WiFi!
Avoid Unihertz.
I did the hackiest, lamest thing back in the day... I had my client write the current date and time to a file on the share every two minutes as a Cron job... Kept it working for months! I saw it on a forum somewhere, tried it, and... Shocked Pikachu face I don't know if I ever disabled that Cron job! Haha!