sending pictures

[N1tr0]

I recently noticed my pictures taking a long time to send, i tried clearing the messaging cache , and rebooting the phone it did not help. Now i have been told my picture are arriving to who i send it to,  but NOT from my phone number.  I checked to see if anything is being forwarded with *#62# , and it nothing is being forwarded. 
My phone I'm using is a One plus 12 R.
I'm concerned that my contacts are receiving pics i sent from a different phone number . anybody know why? How do I stop this?

[N1tr0]

seems to be better ,  thanks !
I will accept this a solution for now , if it happens again i will repost

[softech · Accepted solution]

@N1tr0  

first, try Reset network settings on the phone.

After that, check and confirm APN.  But with OnePlus, there might be a bit more work than simply updating.  Many confirmed that you need to delete the current APN profile first.  Then Add new profile and add according to this, please note case-sensitive and do not add extra spaces.  Remember to save the new APN and then reboot the phone before you try

APN: sp.mb.com
         (or try all upper case SP.MB.COM)
Proxy:
Port:
Username: <blank>
Password: <blank>
Server:
MMSC: http://aliasredirect.net/proxy/mb/mmsc
             (or try:  http://aliasredirect.net/proxy/mmsc)
MMS Proxy: mmscproxy.mobility.ca
MMS Port: 8799
MCC: 302
MNC: 220
Authentication Type: Not Set
APN Type: default,supl,mms
         or    default,mms,agps,supl,fota,hipri
           (might need to include DUN for hotspot, please note case sensitive)
APN protocol: IPv4
APN roaming protocol: IPv4
APN enable/disable: APN enabled
                or  Turn APN on/off APN turned on
Bearer: Unspecified
MVNO (Mobile virtual network operator) type: GID
MVNO (Mobile virtual network operator)value: 4D