There are services that offer bonding like speedify but I don't think iPhone is supported for bonding multiple cellular connections. Not sure if Android phones do. Maybe someone has experience with it?
Speedify lets you bond the cellular to the wifi. It doesn’t let you use the LTE AND 5g from you phone at same time. But it does let you join another phone’s hotspot so you can combine your cellular with the other phone’s cellular.
The iPhone isn't using bleeding edge 5G and doesn't let you lock to 5G Standalone, from what I have seen on Android using 5G Standalone (which nixes bonding with LTE) gets rid of most of the jitter that causes data connection lag.
The IMS core that powers calling and texting on most cellular networks has not been upgraded to route calls and texts over 5G Standalone yet (or if so, it doesn't seem to work with the Pixel 6 or 7 on T-Mobile or AT&T), meaning most phones stay on 5G Non-Standalone which is a substandard experience.
> The IMS core that powers calling and texting on most cellular networks has not been upgraded to route calls and texts over 5G Standalone yet (or if so, it doesn't seem to work with the Pixel 6 or 7 on T-Mobile or AT&T), meaning most phones stay on 5G Non-Standalone which is a substandard experience.
This is not true. T-Mobile has been allowing voNR calls on their network for over 2 years now on SA. It's up to to the handset to have it configured in modem firmware (it is configurable on Qualcomm chipsets through EFS). AT&T appears to be allowing voNR calls since around August of last year.
As for the 5G NSA substandard experience, most phones on the market don't support SA carrier aggregation. Without that the experience sucks, This is a hardware feature you'd need a flagship phone built within past 2 years to support (new ones do 3CA, older ones do 2CA). Better to leave on NSA for these phones or stay on LTE until more spectrum refarmed to NR.
